[rules-users] NPE in RightTuple

[Evans, Jess]

Possibly, upon inspection I found an entity class with suspicious looking hashCode and equals methods (source generate equals/hashcode is still to hard for some people it seems).  I'm trying to recreate a simple test case, to reproduce.  What's the simplest rule to generate a RightTupleIndexHashTable?  Will any attribute constraint do e.g.:

 

BadClass($value : value)

BadClass(value == $value)

 

Thanks,

 

-Jess

 

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at 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 at 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

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