[jboss-jira] [JBoss JIRA] (DROOLS-844) Crash when node is deleted from query node

[Fabian Meyer (JIRA)]

    [ https://issues.jboss.org/browse/DROOLS-844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088444#comment-13088444 ] 

Fabian Meyer commented on DROOLS-844:
-------------------------------------

I can't create a reproducer. Drools is embedded in my application and the error occures inevitable but non deterministic.

> Crash when node is deleted from query node
> ------------------------------------------
>
>                 Key: DROOLS-844
>                 URL: https://issues.jboss.org/browse/DROOLS-844
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 6.3.0.Beta2
>            Reporter: Fabian Meyer
>            Assignee: Mario Fusco
>            Priority: Critical
>
> When a left delete is performed on a PhreakQueryNode, the fact handle of the left tuple might be null, resulting in a NullPointerException.
> Exception in thread "Thread-6" java.lang.NullPointerException
> 	at org.drools.core.phreak.PhreakQueryNode.doLeftDeletes(PhreakQueryNode.java:176)
> 	at org.drools.core.phreak.PhreakQueryNode.doNode(PhreakQueryNode.java:46)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.evalQueryNode(RuleNetworkEvaluator.java:460)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:360)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.doRiaNode(RuleNetworkEvaluator.java:598)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:524)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:336)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:166)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:123)
> 	at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:194)
> 	at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:73)
> 	at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:973)
> 	at org.drools.core.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1251)
> 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1353)
> 	at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1331)



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