Run tests against Jackson 2.12 to ensure runtime compatibility

.github/workflows/build.yml

@@ -38,6 +38,10 @@ jobs:
       - name: Build
         run: ./mvnw --batch-mode --no-transfer-progress --show-version --settings .github/maven/settings.xml verify
 
+      # Run tests against Jackson 2.12 to ensure runtime compatibility (do not recompile)
+      - name: Test Jackson 2.12
+        run: ./mvnw --batch-mode --no-transfer-progress --show-version --settings .github/maven/settings.xml -Djackson.version=2.12.5 surefire:test
+
       - name: Upload Test Reports
         uses: actions/upload-artifact@v2
         if: ${{ always() }}

README.md

@@ -107,7 +107,7 @@ then ensure the required dependencies (and appropriate versions) as specified in
 from the maven repository exist on the runtime classpath.
 Specifically, the following need to be available on the runtime classpath:
 
-* jackson-databind / jackson-core / jackson-annotations
+* jackson-databind / jackson-core / jackson-annotations >= 2.12.0
 * logback-core >= 1.2.0
 * logback-classic >= 1.2.0 (required for logging _LoggingEvents_)
 * logback-access >= 1.2.0 (required for logging _AccessEvents_)

pom.xml

@@ -455,6 +455,13 @@
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-surefire-plugin</artifactId>
                     <version>${maven-surefire-plugin.version}</version>
+                    <configuration>
+                        <!--
+                            GitHub CI runs tests against different jackson versions.
+                            Therefore, differentiate the report directories by jackson versions.
+                        -->
+                        <reportsDirectory>${project.build.directory}/surefire-reports/jackson-${jackson.version}</reportsDirectory>
+                    </configuration>
                 </plugin>
 
                 <plugin>