[rules-users] Drools Flow : Persistence :- Getting Null Pointer Exception in JPAWorkItemManager.java

[Kris Verlaenen]

How are you calling completeWorkItem (could you show me the entire stack
trace)?  When you use persistence, you must make sure all (asynchronous)
invocations to the engine go through the session (as that will make sure
the entity manager is created and changes get persisted afterwards).  As
a result, if your work item is completed asynchronously, you should
complete it using ksession.getWorkItemManager().completeWorkItem(..)
(and not using the WorkItemManager reference you got during
executeWorkItem(..) as that is for synchronous use only).

Kris

Quoting Pardeep.Ruhil at lntinfotech.com:

> Hi,
> When I try to run a sample test case using drools-persistence.jar it
> works 
> successfully.
> But when I try to include the persistence in my OFBiz application, I
> am 
> getting null pointer exception in class JPAWorkItemManager.java.
> 
> java.lang.NullPointerException 
>  at 
>
org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(
> JPAWorkItemManager.java:85).
> 
> Null Pointer is because of getting EntityManager object as NULL. In
> the 
> below line of JPAWorkItemManager.java
>   EntityManager em = (EntityManager) this.workingMemory
> .getEnvironment().get( EnvironmentName.ENTITY_MANAGER );
> the em is null.
> Because of this I am getting Null Pointer exception when it try to
> run the 
> code
>  if (workItemInfo == null) {
>                 workItemInfo = em.find(WorkItemInfo.class, id);
>         }
>  
> Can you tell me why I getting NPE when I try to run the jar file in
> my 
> application.
> While the code run successfully when I try to run sample test case
> for 
> that.
> Please help me to get through the situation.
> 
> 
> Thanks & Regards
> 
> Pardeep Ruhil
> L&T Infotech Ltd
> Mumbai
> Ph: +919820283884
> 
> Larsen & Toubro Infotech Ltd.
> www.Lntinfotech.com
> 
> This Document is classified as: 
> 
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