Marek Novotny, the final fix was done here: https://github.com/jboss-jdf/jboss-as-quickstart/pull/594

We made sure all POM files defined the maven.compiler.target and maven.compiler.source properties:

+ <!-- maven-compiler-plugin -->
+ <maven.compiler.target>1.6</maven.compiler.target>
+ <maven.compiler.source>1.6</maven.compiler.source>

We removed the compiler plugin:

• <plugin>
• <artifactId>maven-compiler-plugin</artifactId>
• <version>$ {version.compiler.plugin}

  </version>

• <configuration>
• <source>$ {maven.compiler.source}

  </source>

• <target>$ {maven.compiler.target}

  </target>

• </configuration>
• </plugin>