[rules-users] Facing Problem with this exception

Wed Mar 5 02:47:41 EST 2014

Hi All,
We are getting the following exceptions when drools is executing some rules.

Exception:

Caused by: java.lang.NullPointerException
        at org.drools.core.util.LeftTupleIndexHashTable.remove(LeftTupleIndexHashTable.java:251)
        at org.drools.reteoo.NotNode.retractLeftTuple(NotNode.java:226)
        at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:217)
        at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractRightTuple(SingleLeftTupleSinkAdapter.java:124)
        at org.drools.reteoo.JoinNode.retractRightTuple(JoinNode.java:151)
        at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:232)
        at org.drools.reteoo.ReteooWorkingMemory$WorkingMemoryReteExpireAction.execute(ReteooWorkingMemory.java:412)
        at org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1471)
        ... 51 more

Regards,
Mallikarjun K
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