add get mapper

modules/openapi-generator/src/main/resources/Java/libraries/jersey2-experimental/JSON.mustache

@@ -62,4 +62,6 @@ public class JSON implements ContextResolver<ObjectMapper> {
   public ObjectMapper getContext(Class<?> type) {
     return mapper;
   }
+
+  public ObjectMapper getMapper() { return mapper; }
 }

samples/client/petstore/java/jersey2-experimental/pom.xml

@@ -68,7 +68,6 @@
                     <parallel>methods</parallel>
                     <useUnlimitedThreads>true</useUnlimitedThreads>
                     <forkMode>pertest</forkMode>
-                    <redirectTestOutputToFile>true</redirectTestOutputToFile>
                 </configuration>
             </plugin>
             <plugin>

samples/client/petstore/java/jersey2-experimental/src/main/java/org/openapitools/client/auth/HttpSignatureAuth.java

@@ -89,7 +89,6 @@ public void setup(Key key) throws ApiException {
   @Override
   public void applyToParams(List<Pair> queryParams, Map<String, String> headerParams, Map<String, String> cookieParams,
                             String payload, String method, URI uri) throws ApiException {
-
     try {
       if (headers.contains("host")) {
         headerParams.put("host", uri.getHost());