[jboss-jira] [JBoss JIRA] (DROOLS-138) AccumulateNode throws NPE

[Jason Barto (JIRA)]

Jason Barto created DROOLS-138:
----------------------------------

             Summary: AccumulateNode throws NPE
                 Key: DROOLS-138
                 URL: https://issues.jboss.org/browse/DROOLS-138
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 5.5.1.Final
         Environment: ### OS ###
Darwin <hostname redacted> 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

### Java Version ###
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06-451-11M4406)
Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01-451, mixed mode)
            Reporter: Jason Barto
            Assignee: Mark Proctor
            Priority: Minor



AccumulateNode throws a NPE when events are inserted too quickly via an entry-point.  A stateful knowledge session to which events are inserted and running an accumulate on the input events.  I have a for loop generating the events and inserting them as rapidly as possible.  In the rules I use an accumulator to calculate the average of the values contained within the events.  The behavior I'm observing is that if I insert ~120 events without any waiting I receive an NPE.  If I Thread.sleep for even just 1ms the test goes off without a hitch.  

The NPE is as follows:
Exception in thread "main" java.lang.NullPointerException
        at org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:1050)
        at org.drools.reteoo.AccumulateNode.modifyLeftTuple(AccumulateNode.java:345)
        at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:259)
        at org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:676)
        at org.drools.reteoo.ReteooWorkingMemory$EvaluateResultConstraints.execute(ReteooWorkingMemory.java:590)
        at org.drools.common.PropagationContextImpl.evaluateActionQueue(PropagationContextImpl.java:350)
        at org.drools.rule.SlidingLengthWindow.assertFact(SlidingLengthWindow.java:119)
        at org.drools.rule.BehaviorManager.assertFact(BehaviorManager.java:94)
        at org.drools.reteoo.WindowNode.assertObject(WindowNode.java:167)
        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)
        at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)
        at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
        at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:127)
        at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:55)
        at drools5fusioneval.Average.main(Average.java:66)



--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira