[rules-users] [droolsflow] JPAProcessInstanceManager - NullPointerException - part 2

[Bill Tarr]

sorry, that email went of prematurely.

I am firing an event at a process created

    session = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);
    processInstance = session.startProcess(CLAIM_FLOW, parameterMap);

the process is fired, and this is the line which throws the NullPointerException:

    process.signalEvent("DocReviewedEvent", null);

Here is my logging info:

   Doc Reviewed Event id=16
   Doc Reviewed Join id=17
   Set Complete id=22
   End id=3

   java.lang.NullPointerException

So as you can see the process completed during the event. 

 at org.drools.persistence.processinstance.JPAProcessInstanceManager.removeProcessInstance(JPAProcessInstanceManager.java:82)

which is this line:

        ProcessInstanceInfo processInstanceInfo = em.find( ProcessInstanceInfo.class,
                                                           processInstance.getId() );

It's actually the EntityManager which is returning null... I wonder why?