[rules-users] Persistence with Drools 5.0.1 (was Persistence with Drools 5.1.0.M2)

[Rory Farrell]

I originally had:

manager.completeWorkItem(workItem.getId(), results);

but I changed it to see if it would make a difference.

I get the ksession reference and store it in the constructor of the work 
item handler:

WorkItemHandler handler = new MyWorkItemHandler(ksession);
ksession.getWorkItemManager().registerWorkItemHandler("Human Task", 
handler);

public MyWorkItemHandler(StatefulKnowledgeSession ksession) {
     this.ksession = ksession;
}

Regards,
Rory

On 7/24/2010 8:42 AM, Mauricio Salatino wrote:
> did you try replacing:
> ksession.getWorkItemManager()
> .completeWorkItem(workItem.getId(), results);
>
> for
>
> manager.completeWorkItem(workItem.getId(), results);
> ?
>
> where do you get the ksession reference?
>
> Greetings
>
>
> 2010/7/23 Rory Farrell <rjf at bellsouth.net <mailto:rjf at bellsouth.net>>
>
>     Hi, I was trying to get persistence working in Drools 5.1.0.M2 but
>     ran into some issues:
>
>     http://drools-java-rules-engine.46999.n3.nabble.com/Persistence-with-Drools-5-1-0-M2-td973691.html#none
>
>     I decided to try with 5.0.1 to see if I had any better luck.  I ran
>     into the same problem:
>
>     java.lang.NullPointerException
>             at
>     org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:85)
>
>     Line 85 is:
>
>     workItemInfo = em.find(WorkItemInfo.class, id);
>
>     The JPAWorkItemManager tries to retrieve the EntityManager from the
>     environment:
>
>     EntityManager em = (EntityManager)
>     this.workingMemory.getEnvironment().get(
>     EnvironmentName.ENTITY_MANAGER );
>
>     and the EntityManager is not in the environment.
>
>     The EntityManagerFactory is in the environment and I see where the
>     SingleSessionCommandService class uses the factory to instantiate an
>     EntityManager, but it never gets put in the environment for the
>     JPAWorkItemManager to retrieve it.
>
>     I was using the UIWorkItemHandler from the example applications.  I
>     wrote a dummy WorkItemHandler to replace the UIWorkItemHandler:
>
>     public void executeWorkItem(WorkItem workItem, WorkItemManager
>     manager) {
>         Map<String, Object> results = new HashMap<String, Object>();
>         System.out.println("Before complete work item");
>         ksession.getWorkItemManager().completeWorkItem(workItem.getId(),
>     results);
>         System.out.println("After complete work item");
>     }
>
>     This fixed the NullPointerException but the role flow process was
>     not detecting that the work item had been completed.  I debugged
>     into the completeWorkItem code and I found that JPAWorkItemManager
>     class called the ProcessInstance.signalEvent method with
>     "workItemCompleted" but the WorkflowProcessInstanceImpl.signalEvent
>     method found no eventListeners for that type.
>
>     I can see the eventListeners for "workItemCompleted" and for
>     "workItemAborted" when I do a ksession.update but the eventListeners
>     are not there when my WorkItemHandler is called.
>
>     This only happens when the flow is resumed from an Event Wait flow
>     by updating a FactHandle.  If the flow goes directly to the Human
>     Task node then the workItem is completed correctly.
>
>     I attached a screenshot of the rule flow.  If there are no missing
>     certification when the process is started then the Human Task is
>     completed successfully.  If there are missing certifications and
>     then the constraint is satisfied by updating a FactHandle then the
>     workItem is not completed correctly and the flow does not proceed to
>     sending the email.
>
>     This all works correctly if I don't try to persist the rule flow.
>
>     Hopefully someone can provide some insight as to what is going on here.
>
>     Regards,
>     Rory
>
>     _______________________________________________
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>
>
>
>
> --
>   - CTO @ http://www.plugtree.com
>   - MyJourney @ http://salaboy.wordpress.com
>   - Co-Founder @ http://www.jbug.com.ar
>
>   - Salatino "Salaboy" Mauricio -
>
>
>
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