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Unknown error using timer in JEE
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created by <a href="http://community.jboss.org/people/francesco.pietrobelli">Francesco Pietrobelli</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/619852#619852">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi all,</p><p>I have a JEE application with jBPM embedded and I have a process that during his execution flow he reaches a intermediate timer catch event. And so the session with that process is disposed. My problem arises when I load the session after the timer is triggered, <span class="hps">particularly, the thrown exception</span> <span class="hps">is:</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>2011-08-05 17:03:54,659 ERROR <a class="jive-link-external-small" href="org.drools.persistence.SingleSessionCommandService">org.drools.persistence.SingleSessionCommandService</a> (pool-26-thread-1) Could not commit session</p><p>java.lang.NullPointerException</p><p>          at org.drools.persistence.jpa.JpaPersistenceContextManager.beginCommandScopedEntityManager(JpaPersistenceContextManager.java:67)</p><p>          at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:287)</p><p>          at org.drools.persistence.jpa.JpaJDKTimerService$JpaJDKCallableJob.call(JpaJDKTimerService.java:75)</p><p>          at org.drools.persistence.jpa.JpaJDKTimerService$JpaJDKCallableJob.call(JpaJDKTimerService.java:63)</p><p>          at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)</p><p>          at java.util.concurrent.FutureTask.run(FutureTask.java:166)</p><p>          at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(ScheduledThreadPoolExecutor.java:165)</p><p>          at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:266)</p><p>          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)</p><p>          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)</p><p>          at java.lang.Thread.run(Thread.java:636)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is the entire stack trace and I haven't any additional information for understand what happened.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Moreover the thread that throws the NPE is different from thread that load the session. Anybody know where to find some information about jBPM threading model?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I can't attach a junit test because i have this problem only when i deploy my application in JBoss5.1, whereas the same process tested with the help of JbpmJunitTestCase doesn't generate any errors.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Regards,</p><p>Francesco.</p></div>
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