BPMSPL-114 - adding new command comments by id: bugfix in JaxbTask

jbpm-human-task/jbpm-human-task-core/src/main/java/org/jbpm/services/task/impl/model/xml/AbstractJaxbTaskObject.java

@@ -84,7 +84,7 @@ protected void initialize(T taskObject, Class<?> objectInterface) {
         } 
     }
 
-    static <T> T unsupported(Class<?> realClass) { 
+    static <T> T unsupported(Class<T> realClass) { 
         String methodName = (new Throwable()).getStackTrace()[1].getMethodName();
         throw new UnsupportedOperationException(methodName + " is not supported on the JAXB " + realClass.getSimpleName() + " implementation.");
     }