[jboss-jira] [JBoss JIRA] (DROOLS-70) NPE when an event expires during evaluation of accumulate when run as fireUntilHalt()

[Edson Tirelli (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-70?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760640#comment-12760640 ] 

Edson Tirelli commented on DROOLS-70:
-------------------------------------

Mario, I've been unable to reproduce this so far. I've run the test you created a ton of times in a loop, but I can't reproduce the error in an i7 cpu.

In any case, the problem here is that event expiration is a WMA, so it shouldn't happen concurrently with any other WMA action (like the insertion of new facts). If it is happening, then the locks in the session are not being properly handled.
                
> NPE when an event expires during evaluation of accumulate when run as fireUntilHalt()
> -------------------------------------------------------------------------------------
>
>                 Key: DROOLS-70
>                 URL: https://issues.jboss.org/browse/DROOLS-70
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>            Reporter: Mario Fusco
>            Assignee: Edson Tirelli
>
> The AccumulateNode.getFirstMatch() throws NPE when some already collected event expires. The problem occurs when thread A is running StatefulKnowledgeSession.fireUntilHalt() while thread B is inserting new events into the session.
> The problem occurs when @expires is defined on the event. The lower the @expires value, the more likely the NPE occurs.
> I added the testEventExpirationDuringAccumulate() to the CepEspTest that reproduces this issue.

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