Hint
//Retrieve task
taskclient.getTask(taskId, responseHandler);
Task task = responseHandler.getTask();
long documentContentId = task.getTaskData().getDocumentContentId();
//Retrieve content using content id
taskclient.getContent(documentContentId, contentResponseHandler);
byte[] objectinBytes = contentResponseHandler.getContent().getContent();
From this byte you can get the object which is a map of input parameters to the human task.
Hope this helps.. :)