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*strong text*What could be the problem if the task-completed event is not getting dispatched to the StatefulKnowledgeSession ?

For a new process-instance, I do

• create a new session 

  register human-task local GenericHTWorkItemHandler

  register custom event listeners

  call startProcess(processDefinitionId,parameters);

It starts a new instance, creates the first human-task via the registered human-task-handler.

When I want to complete the human-task, I do

• restore the KnowledgeSession with JPAKnowledgeService.loadStatefulKnowledgeSession(lastSessionId,kBase,null, env); 

  again register human-task local GenericHTWorkItemHandler

  again register custom event listeners

Then call taskService.completeTask, BUT the task-completed is not dispatched to the KnowledgeSession. And the process-flow is not happening

Should I not register the event listeners again ? Should I not register the work-item-handlers again ?

Update 1 Exception trace:

07:52:09,618 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/workflow-console].[rsservlet]] (http--0.0.0.0-8280-15) Servlet.service() for servlet rsservlet threw exception: java.lang.IllegalStateException: EntityManager is closed
        at org.hibernate.ejb.AbstractEntityManagerImpl.joinTransaction(AbstractEntityManagerImpl.java:1158) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
        at org.drools.container.spring.beans.persistence.DroolsSpringJpaManager.getApplicationScopedPersistenceContext(DroolsSpringJpaManager.java:89) [drools-spring-5.5.0.Final.jar:5.5.0.Final]
        at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:350) [drools-persistence-jpa-5.5.0.Final.jar:5.5.0.Final]
        at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.getEnvironment(CommandBasedStatefulKnowledgeSession.java:478) [drools-core-5.5.0.Final.jar:5.5.0.Final]
        at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:260) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]
        at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.execute(GenericHTWorkItemHandler.java:234) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]
        at org.jbpm.task.service.local.LocalTaskService$SimpleEventTransport.trigger(LocalTaskService.java:329) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]

When reloading a session I am registering new HumanTaskWorkItemhandlers.It keeps on registering event handlers with the TaskService.

When I connect the workItemHandlers, they register eventHandlers with the taskService. When will this eventHandlers get de-registered from the taskService ?

Environment:JBPM 5.4.0.Final, Drools 5.5.0.Final, Jboss 7.1.0.Final

I debugged through the code, task-completed-event was dispatched to more than 1 session.It must be a problem with my ksession management.I created the GenericHTWorkItemHandler with owningKSessionOnly=true  but this didn't worked.