[rules-users] NPE with modify

[Edson Tirelli]

   Scott,

   Seems like a bug to me.
   May I ask you please to zip a self contained sample and open a JIRA? 
I will fix that.

   BTW, 3.0.5 is the lates version and fix some important issues, so you 
may want to update and test. But I don't remember fixing anything 
related to that, so probably you need to open the JIRA anyway.

   Thank you,
        Edson

Scott Reed wrote:

> I am getting an NPE when I uncomment the modify call in the rule below.
> I am running version 3.0.4.
> I'd appreciate any ideas as to why this is happening.
> Thanks,
>  Scott
>
> rule "TEST"
>   when
>       $paystub: Paystub( $grossPay: grossPay )
>       eval( $grossPay.getState() == FPConstants.INACTIVE )
>   then
>       $grossPay.setState( FPConstants.READY );
>       //modify( $paystub );
> end
>
> With modify uncommented I get the following exception:
>
> java.lang.NullPointerException
>   at org.drools.reteoo.beta.DefaultRightMemory.remove(Unknown Source)
>   at org.drools.reteoo.BetaMemory.remove(Unknown Source)
>   at org.drools.reteoo.JoinNode.modifyObject(Unknown Source)
>   at org.drools.reteoo.ObjectSource.propagateModifyObject(Unknown Source)
>   at org.drools.reteoo.ObjectTypeNode.modifyObject(Unknown Source)
>   at org.drools.reteoo.Rete.modifyObject(Unknown Source)
>   at org.drools.reteoo.ReteooRuleBase.modifyObject(Unknown Source)
>   at org.drools.reteoo.ReteooWorkingMemory.modifyObject(Unknown Source)
>   at org.drools.base.DefaultKnowledgeHelper.modifyObject(Unknown Source)
>   at
> org.fp.findata.Rule_Precalc___TEST_0.consequence(Rule_Precalc___TEST_0.java:14) 
>
>
>   at
> org.fp.findata.Rule_Precalc___TEST_0ConsequenceInvoker.evaluate(Rule_Precalc___TEST_0ConsequenceInvoker.java:29) 
>
>
>   at org.drools.common.DefaultAgenda.fireActivation(Unknown Source)
>   at org.drools.common.DefaultAgenda.fireNextItem(Unknown Source)
>   at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source)
>   at org.drools.common.AbstractWorkingMemory.fireAllRules(Unknown Source)
>   at 
> org.fp.util.RuleEngineManager$RunTask.run(RuleEngineManager.java:159)
>
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>


-- 
 Edson Tirelli
 Software Engineer - JBoss Rules Core Developer
 Office: +55 11 3124-6000
 Mobile: +55 11 9218-4151
 JBoss, a division of Red Hat @ www.jboss.com