Indika, I will need to reproduce the problem in order to investigate and fix it. If you can create an isolated test case and open a jira for it, it will be very helpful. Thanks, Edson 2009/12/14 indika kumara <indika.kuma(a)gmail.com&gt; > Hi all > > I have encountered an issue when Droools fusion is run in the stream mode > with 'multithreadEvaluation' and maxThreads=5. The issue is as follows. > > org.drools. > RuntimeDroolsException: Unexpected exception executing action > org.drools.reteoo.PropagationQueuingNode$PropagateAction@8c1400 > at > org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1549) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:160) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:121) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:80) > at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:28) > ......... > Caused by: org.drools.RuntimeDroolsException: > java.lang.NullPointerException > at org.drools.rule.Accumulate.accumulate(Accumulate.java:172) > at > org.drools.reteoo.AccumulateNode.modifyTuple(AccumulateNode.java:424) > at > org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:284) > at > org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:42) > at > org.drools.reteoo.PropagationQueuingNode$AssertAction.execute(PropagationQueuingNode.java:326) > at > org.drools.reteoo.PropagationQueuingNode.propagateActions(PropagationQueuingNode.java:221) > at > org.drools.reteoo.PropagationQueuingNode$PropagateAction.execute(PropagationQueuingNode.java:394) > at > org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1547) > ... 18 more > Caused by: java.lang.NullPointerException > at > org.drools.base.accumulators.MVELAccumulatorFunctionExecutor.accumulate(MVELAccumulatorFunctionExecutor.java:129) > at org.drools.rule.Accumulate.accumulate(Accumulate.java:164) > ... 25 more > > > Then NPE is due to the argument 'context' of the accumulate is null. > > When I run the fusion in the same scenario without > 'multithreadEvaluation' , it works fine. > > Could someone help me to identify the actual issue? > > Thanks Lots > > Indika > > Please Note : I did not inject events concurrently. But , I need to do > that too > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users