diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/openapi2SpringBoot.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/openapi2SpringBoot.mustache
index 1edc9208acb5..dcc993d70898 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/openapi2SpringBoot.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/openapi2SpringBoot.mustache
@@ -1,5 +1,7 @@
 package {{basePackage}};
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -69,4 +71,9 @@ public class OpenAPI2SpringBoot implements CommandLineRunner {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/pom.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/pom.mustache
index 18cd1df2ce5e..637a710a51d4 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-boot/pom.mustache
@@ -137,6 +137,11 @@
             <version>2.8.4</version>
         </dependency>
         {{/threetenbp}}
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
 {{#useBeanValidation}}
     <!-- Bean Validation API support -->
         <dependency>
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/pom.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/pom.mustache
index 4ccbbbb3a801..4e1f61b8ae35 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-cloud/pom.mustache
@@ -81,6 +81,11 @@
             <version>2.6.4</version>
         </dependency>
         {{/threetenbp}}
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/openapiUiConfiguration.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/openapiUiConfiguration.mustache
index a06212751454..a320e19bb927 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/openapiUiConfiguration.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/openapiUiConfiguration.mustache
@@ -5,6 +5,7 @@ import com.fasterxml.jackson.databind.SerializationFeature;
 {{#threetenbp}}
 import com.fasterxml.jackson.datatype.threetenbp.ThreeTenModule;
 {{/threetenbp}}
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
@@ -94,9 +95,7 @@ public class OpenAPIUiConfiguration extends WebMvcConfigurerAdapter {
     return new Jackson2ObjectMapperBuilder()
         .indentOutput(true)
         .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
-        {{#threetenbp}}
-        .modulesToInstall(module)
-        {{/threetenbp}}
+        .modulesToInstall({{#threetenbp}}module, {{/threetenbp}}new JsonNullableModule())
         .dateFormat(new RFC3339DateFormat());
   }
 
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/pom.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/pom.mustache
index 64d4daf20416..81a6a95b9ca4 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/libraries/spring-mvc/pom.mustache
@@ -202,6 +202,11 @@
             <version>${jackson-threetenbp-version}</version>
         </dependency>
         {{/threetenbp}}
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/model.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/model.mustache
index 17abea16f2e9..60d7d41fe48d 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/model.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/model.mustache
@@ -3,6 +3,7 @@ package {{package}};
 import java.util.Objects;
 {{#imports}}import {{import}};
 {{/imports}}
+import org.openapitools.jackson.nullable.JsonNullable;
 {{#serializableModel}}
 import java.io.Serializable;
 {{/serializableModel}}
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/nullableDataType.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/nullableDataType.mustache
new file mode 100644
index 000000000000..bacd0ba3d6b3
--- /dev/null
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/nullableDataType.mustache
@@ -0,0 +1 @@
+{{#isNullable}}JsonNullable<{{{datatypeWithEnum}}}>{{/isNullable}}{{^isNullable}}{{{datatypeWithEnum}}}{{/isNullable}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache b/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
index f49b66eead87..26754d33db2b 100644
--- a/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaSpring/pojo.mustache
@@ -28,16 +28,16 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}}{{^parent}}
   {{/gson}}
   {{#isContainer}}
   {{#useBeanValidation}}@Valid{{/useBeanValidation}}
-  private {{{datatypeWithEnum}}} {{name}}{{#required}} = {{{defaultValue}}}{{/required}}{{^required}} = null{{/required}};
+  private {{>nullableDataType}} {{name}} = {{#isNullable}}JsonNullable.undefined(){{/isNullable}}{{^isNullable}}{{#required}}{{{defaultValue}}}{{/required}}{{^required}}null{{/required}}{{/isNullable}};
   {{/isContainer}}
   {{^isContainer}}
-  private {{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}};
+  private {{>nullableDataType}} {{name}}{{#isNullable}} = JsonNullable.undefined(){{/isNullable}}{{^isNullable}}{{#defaultValue}} = {{{.}}}{{/defaultValue}}{{/isNullable}};
   {{/isContainer}}
 
   {{/vars}}
   {{#vars}}
   public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
-    this.{{name}} = {{name}};
+    this.{{name}} = {{#isNullable}}JsonNullable.of({{name}}){{/isNullable}}{{^isNullable}}{{name}}{{/isNullable}};
     return this;
   }
   {{#isListContainer}}
@@ -84,11 +84,11 @@ public class {{classname}} {{#parent}}extends {{{parent}}}{{/parent}}{{^parent}}
   {{{vendorExtensions.extraAnnotation}}}
   {{/vendorExtensions.extraAnnotation}}
   @ApiModelProperty({{#example}}example = "{{{example}}}", {{/example}}{{#required}}required = {{required}}, {{/required}}{{#isReadOnly}}readOnly = {{{isReadOnly}}}, {{/isReadOnly}}value = "{{{description}}}")
-{{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{{datatypeWithEnum}}} {{getter}}() {
+{{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}  public {{>nullableDataType}} {{getter}}() {
     return {{name}};
   }
 
-  public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  public void {{setter}}({{>nullableDataType}} {{name}}) {
     this.{{name}} = {{name}};
   }
 
diff --git a/samples/client/petstore/spring-cloud/pom.xml b/samples/client/petstore/spring-cloud/pom.xml
index a96055f2c930..1ee79c2f74d0 100644
--- a/samples/client/petstore/spring-cloud/pom.xml
+++ b/samples/client/petstore/spring-cloud/pom.xml
@@ -50,6 +50,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Category.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Category.java
index 3ce216637bf4..b1ad95d3952b 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Category.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/ModelApiResponse.java
index 05bef966b931..cc9dc2341c6d 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Order.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Order.java
index 8d4fde5b5d8b..d46c8f516aa0 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Order.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Pet.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Pet.java
index e4e1a0fd7d33..4ae5f019899c 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Tag.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Tag.java
index 7dc45a89cb07..8eb2e846891a 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/User.java b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/User.java
index fb37ee9c79c2..95d92cd2ecbf 100644
--- a/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/User.java
+++ b/samples/client/petstore/spring-cloud/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/pom.xml b/samples/client/petstore/spring-stubs/pom.xml
index df04e4752b15..a86dc3be43f6 100644
--- a/samples/client/petstore/spring-stubs/pom.xml
+++ b/samples/client/petstore/spring-stubs/pom.xml
@@ -39,6 +39,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Category.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Category.java
index 3ce216637bf4..b1ad95d3952b 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Category.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/ModelApiResponse.java
index 05bef966b931..cc9dc2341c6d 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Order.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Order.java
index 8d4fde5b5d8b..d46c8f516aa0 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Order.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Pet.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Pet.java
index e4e1a0fd7d33..4ae5f019899c 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Tag.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Tag.java
index 7dc45a89cb07..8eb2e846891a 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/User.java b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/User.java
index fb37ee9c79c2..95d92cd2ecbf 100644
--- a/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/User.java
+++ b/samples/client/petstore/spring-stubs/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/pom.xml b/samples/server/petstore/spring-mvc-j8-async/pom.xml
index 8860dbb70da5..c38516914ad0 100644
--- a/samples/server/petstore/spring-mvc-j8-async/pom.xml
+++ b/samples/server/petstore/spring-mvc-j8-async/pom.xml
@@ -117,6 +117,11 @@
             <artifactId>jackson-datatype-jsr310</artifactId>
             <version>${jackson-version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
index e04a1577033a..ecf9e79f65ff 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
@@ -71,6 +72,7 @@ public Jackson2ObjectMapperBuilder builder() {
     return new Jackson2ObjectMapperBuilder()
         .indentOutput(true)
         .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
+        .modulesToInstall(new JsonNullableModule())
         .dateFormat(new RFC3339DateFormat());
   }
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/spring-mvc-j8-async/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/pom.xml b/samples/server/petstore/spring-mvc-j8-localdatetime/pom.xml
index 007aef35494f..2386244d28b5 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/pom.xml
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/pom.xml
@@ -117,6 +117,11 @@
             <artifactId>jackson-datatype-jsr310</artifactId>
             <version>${jackson-version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
index e04a1577033a..ecf9e79f65ff 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
@@ -2,6 +2,7 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
@@ -71,6 +72,7 @@ public Jackson2ObjectMapperBuilder builder() {
     return new Jackson2ObjectMapperBuilder()
         .indentOutput(true)
         .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
+        .modulesToInstall(new JsonNullableModule())
         .dateFormat(new RFC3339DateFormat());
   }
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FormatTest.java
index a6e1c3fff11f..a4d1863fad35 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.LocalDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 08326500ceb9..02ef3036e6b6 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Order.java
index 4459686b086e..7857e777cb50 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.LocalDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/spring-mvc-j8-localdatetime/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/pom.xml b/samples/server/petstore/spring-mvc/pom.xml
index ce4506110d8f..7416f0c0237e 100644
--- a/samples/server/petstore/spring-mvc/pom.xml
+++ b/samples/server/petstore/spring-mvc/pom.xml
@@ -117,6 +117,11 @@
             <artifactId>jackson-datatype-threetenbp</artifactId>
             <version>${jackson-threetenbp-version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
index 0707ad35d41a..838bce567dce 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/configuration/OpenAPIUiConfiguration.java
@@ -3,6 +3,7 @@
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.datatype.threetenbp.ThreeTenModule;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.PropertySource;
@@ -79,7 +80,7 @@ public Jackson2ObjectMapperBuilder builder() {
     return new Jackson2ObjectMapperBuilder()
         .indentOutput(true)
         .featuresToDisable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
-        .modulesToInstall(module)
+        .modulesToInstall(module, new JsonNullableModule())
         .dateFormat(new RFC3339DateFormat());
   }
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 8bef34c6d05e..88a003703b22 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 90d468096f0c..a1fe8166abf8 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index 5a21ab7d938b..a76320466a38 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayTest.java
index e8b4a4190096..df4610324400 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumArrays.java
index 4ccdf3e8436b..6670ea060a0a 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index ab6a17b2c0ee..edc5d19f57ea 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FormatTest.java
index 35d2b5deee89..ef025eda014d 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import org.springframework.core.io.Resource;
 import org.threeten.bp.LocalDate;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MapTest.java
index 6c238c06b71a..165591a35529 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 8744cdeb6a4f..6c0fe72d4773 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.UUID;
 import org.openapitools.model.Animal;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Order.java
index 3f2f47eb605a..88844e05f912 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Pet.java
index 50878ae0d2a0..d6927b19b4d2 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/spring-mvc/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/pom.xml b/samples/server/petstore/springboot-beanvalidation/pom.xml
index 6cdccc35449b..053b3d33f099 100644
--- a/samples/server/petstore/springboot-beanvalidation/pom.xml
+++ b/samples/server/petstore/springboot-beanvalidation/pom.xml
@@ -53,6 +53,11 @@
             <artifactId>jackson-datatype-threetenbp</artifactId>
             <version>2.8.4</version>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index 6d45fdaaf91b..e62a0a1729e3 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -48,4 +50,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 8bef34c6d05e..88a003703b22 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 90d468096f0c..a1fe8166abf8 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index 5a21ab7d938b..a76320466a38 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayTest.java
index e8b4a4190096..df4610324400 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumArrays.java
index 4ccdf3e8436b..6670ea060a0a 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index ab6a17b2c0ee..edc5d19f57ea 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FormatTest.java
index 35d2b5deee89..ef025eda014d 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import org.springframework.core.io.Resource;
 import org.threeten.bp.LocalDate;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MapTest.java
index 6c238c06b71a..165591a35529 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 8744cdeb6a4f..6c0fe72d4773 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.UUID;
 import org.openapitools.model.Animal;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Order.java
index 3f2f47eb605a..88844e05f912 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Pet.java
index 50878ae0d2a0..d6927b19b4d2 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-beanvalidation/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/pom.xml b/samples/server/petstore/springboot-delegate-j8/pom.xml
index 89dde1e2e47f..4c26499044e5 100644
--- a/samples/server/petstore/springboot-delegate-j8/pom.xml
+++ b/samples/server/petstore/springboot-delegate-j8/pom.xml
@@ -52,6 +52,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index cb4725930798..8344ea1283d7 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -47,4 +49,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-delegate-j8/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/pom.xml b/samples/server/petstore/springboot-delegate/pom.xml
index 0922249a473f..cefb505c3c64 100644
--- a/samples/server/petstore/springboot-delegate/pom.xml
+++ b/samples/server/petstore/springboot-delegate/pom.xml
@@ -53,6 +53,11 @@
             <artifactId>jackson-datatype-threetenbp</artifactId>
             <version>2.8.4</version>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index 6d45fdaaf91b..e62a0a1729e3 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -48,4 +50,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 8bef34c6d05e..88a003703b22 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 90d468096f0c..a1fe8166abf8 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index 5a21ab7d938b..a76320466a38 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayTest.java
index e8b4a4190096..df4610324400 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumArrays.java
index 4ccdf3e8436b..6670ea060a0a 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index ab6a17b2c0ee..edc5d19f57ea 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FormatTest.java
index 35d2b5deee89..ef025eda014d 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import org.springframework.core.io.Resource;
 import org.threeten.bp.LocalDate;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MapTest.java
index 6c238c06b71a..165591a35529 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 8744cdeb6a4f..6c0fe72d4773 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.UUID;
 import org.openapitools.model.Animal;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Order.java
index 3f2f47eb605a..88844e05f912 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.threeten.bp.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Pet.java
index 50878ae0d2a0..d6927b19b4d2 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-delegate/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/pom.xml b/samples/server/petstore/springboot-implicitHeaders/pom.xml
index 5495d34798b4..987710c5de54 100644
--- a/samples/server/petstore/springboot-implicitHeaders/pom.xml
+++ b/samples/server/petstore/springboot-implicitHeaders/pom.xml
@@ -52,6 +52,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index cb4725930798..8344ea1283d7 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -47,4 +49,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-implicitHeaders/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/pom.xml b/samples/server/petstore/springboot-reactive/pom.xml
index 4f3818a86cfd..880a1dba10ba 100644
--- a/samples/server/petstore/springboot-reactive/pom.xml
+++ b/samples/server/petstore/springboot-reactive/pom.xml
@@ -54,6 +54,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index f38e8a28ffa4..3b9214455ac9 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -53,4 +55,9 @@ public void addResourceHandlers(ResourceHandlerRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-reactive/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/pom.xml b/samples/server/petstore/springboot-useoptional/pom.xml
index 20429c0fc5fc..fb5ac072dcb3 100644
--- a/samples/server/petstore/springboot-useoptional/pom.xml
+++ b/samples/server/petstore/springboot-useoptional/pom.xml
@@ -52,6 +52,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index cb4725930798..8344ea1283d7 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -47,4 +49,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot-useoptional/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/pom.xml b/samples/server/petstore/springboot-virtualan/pom.xml
index c13fb400aff8..220257f505d1 100644
--- a/samples/server/petstore/springboot-virtualan/pom.xml
+++ b/samples/server/petstore/springboot-virtualan/pom.xml
@@ -52,6 +52,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index 5f8148a921b7..6ad1cf971739 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -47,4 +49,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/AdditionalPropertiesClass.java
index 56304445adfb..cb66f641276d 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Animal.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Animal.java
index ee60cb1a21cb..baedd9662ba6 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Animal.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfArrayOfNumberOnly.java
index 83ca5fbd61cd..97983a205d65 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfNumberOnly.java
index 4f4ad0761f19..c621a5abdd83 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayTest.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayTest.java
index b5d14b007304..a1c0e06ea614 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayTest.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.virtualan.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Capitalization.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Capitalization.java
index 860a3b309049..37fbab45b5de 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Capitalization.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Cat.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Cat.java
index 8759d4e84509..331c4f9b8a7e 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Cat.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.virtualan.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Category.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Category.java
index a36ebae90c60..1de7ecef165d 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Category.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ClassModel.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ClassModel.java
index b5f87ae61702..c9963672df27 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ClassModel.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Client.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Client.java
index 10ebed01e540..bdfe8ab1441d 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Client.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Dog.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Dog.java
index 88e3a3ec05f0..725645f19dec 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Dog.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.virtualan.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumArrays.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumArrays.java
index 803f267c5df7..181c4cca57b2 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumArrays.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumClass.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumClass.java
index 408833a2482f..0ab198d6ca7f 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumClass.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumTest.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumTest.java
index c5da3beda283..7af251c4b35c 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumTest.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.virtualan.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FileSchemaTestClass.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FileSchemaTestClass.java
index 6af62b775236..9940cdc7798c 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FormatTest.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FormatTest.java
index a81818cb1e6b..bfbf0224efc7 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FormatTest.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/HasOnlyReadOnly.java
index 179fdcdc9cb7..722c0d1e398c 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MapTest.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MapTest.java
index bc5747e62d11..12029f36ad30 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MapTest.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 014a0a7b2b62..0bbe7b8446fe 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.virtualan.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Model200Response.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Model200Response.java
index 91bada12c568..83cc4f8174cb 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Model200Response.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelApiResponse.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelApiResponse.java
index e05e2887d524..8ff519aea3e7 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelReturn.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelReturn.java
index 59482164ae15..16f683d95dc7 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelReturn.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Name.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Name.java
index be4f6ee21317..fd419b60a0cf 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Name.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/NumberOnly.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/NumberOnly.java
index 5e84248183e4..494ac9d66d95 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/NumberOnly.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Order.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Order.java
index 846ecfae7e3b..c03781f29f47 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Order.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterComposite.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterComposite.java
index 44c8f2f0c400..cdff3253b98d 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterComposite.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterEnum.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterEnum.java
index cd7f3b134e93..572a8c72e1c7 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterEnum.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Pet.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Pet.java
index 60b90c900cb0..85f8cba0ed22 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Pet.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.virtualan.model.Category;
 import org.openapitools.virtualan.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ReadOnlyFirst.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ReadOnlyFirst.java
index 3e0b3154fe3d..2526f0d1f72f 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/SpecialModelName.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/SpecialModelName.java
index c0449ae3d342..b4bc84c7b910 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Tag.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Tag.java
index dc4a11688bcd..b833cfcd350a 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Tag.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/User.java b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/User.java
index bb20168178ed..b5a97b806c97 100644
--- a/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/User.java
+++ b/samples/server/petstore/springboot-virtualan/src/main/java/org/openapitools/virtualan/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/pom.xml b/samples/server/petstore/springboot/pom.xml
index 477821557afc..5ff1f68b5615 100644
--- a/samples/server/petstore/springboot/pom.xml
+++ b/samples/server/petstore/springboot/pom.xml
@@ -52,6 +52,11 @@
             <groupId>com.fasterxml.jackson.datatype</groupId>
             <artifactId>jackson-datatype-jsr310</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.openapitools</groupId>
+            <artifactId>jackson-databind-nullable</artifactId>
+            <version>0.1.0</version>
+        </dependency>
     <!-- Bean Validation API support -->
         <dependency>
             <groupId>javax.validation</groupId>
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/OpenAPI2SpringBoot.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
index cb4725930798..8344ea1283d7 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/OpenAPI2SpringBoot.java
@@ -1,5 +1,7 @@
 package org.openapitools;
 
+import com.fasterxml.jackson.databind.Module;
+import org.openapitools.jackson.nullable.JsonNullableModule;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.ExitCodeGenerator;
 import org.springframework.boot.SpringApplication;
@@ -47,4 +49,9 @@ public void addCorsMappings(CorsRegistry registry) {
         };
     }
 
+    @Bean
+    public Module jsonNullableModule() {
+        return new JsonNullableModule();
+    }
+
 }
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
index 73d1926afdd0..4845592fef18 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -8,6 +8,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Animal.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Animal.java
index f11373372b92..68d2e740966b 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Animal.java
@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.annotation.JsonTypeInfo;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index b435e834c8b2..d4aeef01b3e3 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
index c9583813e8c7..b2da4b9b26a6 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -8,6 +8,7 @@
 import java.math.BigDecimal;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayTest.java
index a1e93f406276..fb134a8c4419 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ArrayTest.java
@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import org.openapitools.model.ReadOnlyFirst;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Capitalization.java
index 987bdb03dc57..e1346fe63ea8 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Capitalization.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Cat.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Cat.java
index 97c3302c72e6..9f9e1235f7fd 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Cat.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Category.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Category.java
index a09ed25bd4eb..db3f8e08dc0d 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Category.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ClassModel.java
index 9c2dc39d81bb..ba96dc2add68 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ClassModel.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Client.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Client.java
index 782a2dfa2428..59d479c85336 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Client.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Dog.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Dog.java
index f766c99aaaf6..6a99a1bf28bf 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Dog.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumArrays.java
index f2b794bde990..398140f21e47 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumArrays.java
@@ -8,6 +8,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumClass.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumClass.java
index e51d076b160c..d44240f320c7 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumClass.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumClass.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumTest.java
index e6864fdc4b58..c49ea5efc797 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/EnumTest.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import org.openapitools.model.OuterEnum;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FileSchemaTestClass.java
index be3e2e1e86c4..cb144d259aef 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FileSchemaTestClass.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModelProperty;
 import java.util.ArrayList;
 import java.util.List;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FormatTest.java
index 6e403c6b5ce1..e53660b6a946 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/FormatTest.java
@@ -10,6 +10,7 @@
 import java.time.OffsetDateTime;
 import java.util.UUID;
 import org.springframework.core.io.Resource;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
index c68254f2c8e5..c0e7dd75528e 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MapTest.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MapTest.java
index 541bf0981ae1..a1872ddfa25c 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MapTest.java
@@ -9,6 +9,7 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 4f8a86dec579..6f7a0b5d56e3 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import java.util.Map;
 import java.util.UUID;
 import org.openapitools.model.Animal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Model200Response.java
index 98190d7ad199..04606fb90460 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Model200Response.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelApiResponse.java
index 8712360f7a70..1d385b21bd4d 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelApiResponse.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelReturn.java
index a64ca866ed3f..82026635f5cb 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ModelReturn.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Name.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Name.java
index 6c702dcf583b..1180f019ea3f 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Name.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/NumberOnly.java
index 2cc007cf602e..4423a2ac631d 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/NumberOnly.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Order.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Order.java
index 33255a798156..7622ac236efa 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Order.java
@@ -7,6 +7,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.time.OffsetDateTime;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterComposite.java
index d1e12b80ea9f..61dbaaefeeae 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterComposite.java
@@ -6,6 +6,7 @@
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
 import java.math.BigDecimal;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterEnum.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterEnum.java
index fc24b7769521..691d30a98d89 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterEnum.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/OuterEnum.java
@@ -2,6 +2,7 @@
 
 import java.util.Objects;
 import com.fasterxml.jackson.annotation.JsonValue;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Pet.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Pet.java
index 5c0704400bb9..2b687fce4616 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Pet.java
@@ -10,6 +10,7 @@
 import java.util.List;
 import org.openapitools.model.Category;
 import org.openapitools.model.Tag;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ReadOnlyFirst.java
index 8ce8467a8bd3..4e1c3e681095 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/ReadOnlyFirst.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/SpecialModelName.java
index d2edd48e1370..6c0bfa749d3d 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/SpecialModelName.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Tag.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Tag.java
index bc9c1ed59dda..c72064ce0428 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/Tag.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;
 
diff --git a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/User.java b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/User.java
index 09a60b45d168..d195089778a9 100644
--- a/samples/server/petstore/springboot/src/main/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/springboot/src/main/java/org/openapitools/model/User.java
@@ -5,6 +5,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import io.swagger.annotations.ApiModel;
 import io.swagger.annotations.ApiModelProperty;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.validation.Valid;
 import javax.validation.constraints.*;