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

[Mauricio Salatino]

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>

> 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
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


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