To get the workitem id, this is what you can do..
First you need the object Task.
TaskClient objClient = new TaskClient(new HornetQTaskClientConnector(strName, new HornetQTaskClientHandler(SystemEventListenerFactory.getSystemEventListener())));
objClient.connect(strIpAddress, intPort);
BlockingGetTaskResponseHandler objResponseHandler = new BlockingGetTaskResponseHandler();
Task objTask = new Task();
objClient.getTask(intTask, objResponseHandler);
objTask = objResponseHandler.getTask();
Once you have the object, you can use it like following to get workitem id..
intWorkItemId = objTask.getTaskData().getWorkItemId();
Regards,