ElementGsonAdaptor elementGsonAdaptor = new ElementGsonAdaptor(); GsonBuilder builder = new GsonBuilder() .setExclusionStrategies(new NonSerializableExclusionStrategy()) .registerTypeAdapter(EventMessageBundle.class, new EventMessageBundleGsonAdaptor()) .registerTypeAdapter(OperationRequest.class, new OperationRequestGsonAdaptor(opNamespace))