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

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)