[jboss-jira] [JBoss JIRA] Created: (JBRULES-2953) AccumulateNode runs into NPE

[Alessandro Lazarotti (JIRA)]

AccumulateNode runs into NPE
----------------------------

                 Key: JBRULES-2953
                 URL: https://issues.jboss.org/browse/JBRULES-2953
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 5.1.1.FINAL
            Reporter: Alessandro Lazarotti
            Assignee: Edson Tirelli
            Priority: Critical
             Fix For: 5.2.0.M1
         Attachments: DroolsTest.java, JB2887.zip, SampleAlarmRules.drl

A rule such as
rule "average"
when
    B( id < 10 )
    $list: List() from collect ( A() over window:time(10s) )
           Number( $avg: doubleValue ) from accumulate( A( $id : id ) from $list, average( $id ) )
then
    System.out.println( "average = " + $avg );
end

runs into a NPE

Caused by: java.lang.NullPointerException
	at org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:967)
	at org.drools.reteoo.AccumulateNode.splitList(AccumulateNode.java:920)
	at org.drools.reteoo.AccumulateNode.removePreviousMatchesForLeftTuple(AccumulateNode.java:874)
	at org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:205)
	at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateRetractLeftTuple(CompositeLeftTupleSinkAdapter.java:238)
	at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateRetractLeftTupleDestroyRightTuple(CompositeLeftTupleSinkAdapter.java:138)
	at org.drools.reteoo.AccumulateNode.retractLeftTuple(AccumulateNode.java:212)
	at org.drools.reteoo.ModifyPreviousTuples.retractTuples(ModifyPreviousTuples.java:111)
	at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:176)
	at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:450)
	at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:361)
	at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:183)
	at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:196)
	at event.Rule_launch_0.defaultConsequence(Rule_launch_0.java:7)
	at event.Rule_launch_0DefaultConsequenceInvoker.evaluate(Rule_launch_0DefaultConsequenceInvoker.java:33)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:913)


A null Parameter accctx is passed down from retractLeftTuple. 





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