You have to register the task to the workitem. You can take a look at the user guide:
http://docs.jboss.org/jbpm/v5.1/userguide/ch13.html#d0e3599
Something like
ksession.getWorkItemManager().registerWorkItemHandler( "task1", new WorkItemHandler1()
ksession.getWorkItemManager().registerWorkItemHandler( "task2", new WorkItemHandler2()
Hope it helps,
Demian
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