[rules-users] NPE on retract

[Mark Proctor]

Have you correctly implemented your equals and hashcode? Have you made 
sure that the objects fields haven't changed between the assert and the 
retract?

Mark
Chris West wrote:
> Hi,
>
> Using version 3.0.6 of jboss rules, while retracting an object, I get 
> the following:
>
>  java.lang.NullPointerException
>     at 
> org.drools.reteoo.beta.InstanceEqualConstrRightMemory.remove(Unknown 
> Source)
>     at org.drools.reteoo.BetaMemory.remove (Unknown Source)
>     at org.drools.reteoo.NotNode.retractObject(Unknown Source)
>     at org.drools.reteoo.ObjectSource.propagateRetractObject(Unknown 
> Source)
>     at org.drools.reteoo.RightInputAdapterNode.retractTuple (Unknown 
> Source)
>     at org.drools.reteoo.TupleSource.propagateRetractTuple(Unknown Source)
>     at org.drools.reteoo.NotNode.retractTuple(Unknown Source)
>     at org.drools.reteoo.TupleSource.propagateRetractTuple (Unknown 
> Source)
>     at org.drools.reteoo.JoinNode.retractObject(Unknown Source)
>     at org.drools.reteoo.ObjectSource.propagateRetractObject(Unknown 
> Source)
>     at org.drools.reteoo.ObjectTypeNode.retractObject (Unknown Source)
>     at org.drools.reteoo.Rete.retractObject(Unknown Source)
>     at org.drools.reteoo.ReteooRuleBase.retractObject(Unknown Source)
>     at org.drools.reteoo.ReteooWorkingMemory.doRetract(Unknown Source)
>     at org.drools.common.AbstractWorkingMemory.retractObject(Unknown 
> Source)
>     at org.drools.common.AbstractWorkingMemory.retractObject(Unknown 
> Source)
>     at 
> ascc.rules.AbstractRulesCoordinator.statusChanged(AbstractRulesCoordinator.java 
> :354)
>     at 
> ascc.rules.AbstractRulesCoordinator$1.statusChanged(AbstractRulesCoordinator.java:111)
>     at ascc.status.BaseStatusBoard.notifyChange(BaseStatusBoard.java:211)
>     at ascc.status.BaseStatusBoard.notifyChange (BaseStatusBoard.java:191)
>     at 
> ascc.status.DefaultParkingStatusBoard.empty(DefaultParkingStatusBoard.java:318)
>     at 
> ascc.spotting.DefaultSpottingCoordinator.computeInitialSpot(DefaultSpottingCoordinator.java:578) 
>
>     at 
> ascc.spotting.DefaultSpottingCoordinator.statusCreated(DefaultSpottingCoordinator.java:827)
>     at ascc.status.BaseStatusBoard.notifyCreate(BaseStatusBoard.java:100)
>     at ascc.status.BaseStatusBoard.notifyCreate (BaseStatusBoard.java:80)
>     at 
> ascc.status.DefaultAirPlanStatusBoard.missionAssignmentComplete(DefaultAirPlanStatusBoard.java:479)
>     at 
> ascc.missionassignment.Rule_6___Complete_mission_assignment_for_event_0.consequence 
> (Rule_6___Complete_mission_assignment_for_event_0.java:36)
>     at 
> ascc.missionassignment.Rule_6___Complete_mission_assignment_for_event_0ConsequenceInvoker.evaluate(Rule_6___Complete_mission_assignment_for_event_0ConsequenceInvoker.java:24) 
>
>     ... 7 more
>
> Is there something I could be doing wrong?  Is this a known bug?
>
> Thanks,
> -Chris
> ------------------------------------------------------------------------
>
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