If you are using the SNAPSHOT you don't need to worry about it. The exception that you get:
"org.drools.WorkItemHandlerNotFoundException: Could not find work item handler for Human Task"
Can be solved just registering the "Human Task" WorkItem Handler
Did you do something like:
ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new CommandBasedWSHumanTaskHandler(ksession));?
What is the error now?