Are you asking how to get the workItem manager for the human task?
First we get the session and create a human task workItem handler and feed the session to it.
Next we use the session to get teh workitem manager.
objTaskHandler = new HornetQHTWorkItemHandler(objKSession);
objTaskHandler.setIpAddress(strIpAddress);
objTaskHandler.setPort(intPort);
WorkItemManager objWiMgr = objKSession.getWorkItemManager();
Regards.