Thanks,

-Jess

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Wednesday, January 14, 2009 4:43 PM
To: Rules Users List
Subject: Re: [rules-users] NPE in RightTuple

   Looks like a bug. Can you please open a JIRA with a test case? My guess is that your rules are changing a fact attribute that is causing the equals()/hashcode() methods of the object to return a different result?

    []s
    Edson

2009/1/14 Evans, Jess <JEvans@collegeboard.org>

Does anyone know what this would be indicative of? I've seen it occur periodically at which point I have to discard the session. I flatten and assert my data, run the rules, and then retract the handles collected on assertion. I've ensured the fact handle parameter is never null. I have the stateful session wrapped in a synchronized business façade, so I don't think it should be a concurrency issue (unless I have a bug of course). I'm running Drools 5 M4.

java.lang.NullPointerException

at org.drools.util.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java:224)

at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:204)

at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:210)

at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:190)

at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1078)

at org.drools.common.AbstractWorkingMemory.retract(AbstractWorkingMemory.java:1045)

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Edson Tirelli
JBoss Drools Core Development
JBoss, a division of Red Hat @ www.jboss.com