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