[rules-users] Accumulating over a list of collected events (bug?)

[Wolfgang Laun]

I cannot confirm/reproduce this with 5.1.1.

Please provide version info and a complete example causing this error?

-W


On 6 February 2011 02:18, OlliSee <o.roess at seeburger.de> wrote:

>
> Hi folks, another bug discovered here?
>
> This rule yields a really nice exception
>
> rule "Test"
>        when
>                $list : List() from collect ( A() over window:time(5s) )
>                Number($avg : doubleValue) from accumulate( A($num : num)
> from $list, average($num))
>        then
>                ...
> end
>
> whereas
>             Number($avg : doubleValue) from accumulate( A($num : num) over
> window:time(5s), average($num))
> works fine.
>
> So it seems I can't accumulate over the list. But would be quite handy if I
> had more than one accumulation to do and didn't want to rewrite all the
> constraints in each accumulation statement. I could just use the list, but
> that results in the exception below.
>
>
> Exception in thread "Thread-5" org.drools.RuntimeDroolsException:
> Unexpected
> exception executing action
> org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction at 46fef3
>        at
>
> org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1473)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1159)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1123)
>        at
>
> org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
>        at
>
> org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:251)
>        at
> trafficsys.SessionInterface.insertAndFire(SessionInterface.java:144)
>        at
>
> trafficsys.cep.SensorEventGenerator.generateEvents(SensorEventGenerator.java:80)
>        at de.trafficsimulation.MicroStreet.update(MicroStreet.java:393)
>        at de.trafficsimulation.SimCanvas.run(SimCanvas.java:401)
>        at java.lang.Thread.run(Unknown Source)
> 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.SingleLeftTupleSinkAdapter.doPropagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:217)
>        at
>
> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateRetractLeftTuple(SingleLeftTupleSinkAdapter.java:91)
>        at
>
> org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:648)
>        at
>
> org.drools.reteoo.AccumulateNode.removePreviousMatchesForRightTuple(AccumulateNode.java:903)
>        at
> org.drools.reteoo.AccumulateNode.retractRightTuple(AccumulateNode.java:303)
>        at
> org.drools.rule.SlidingTimeWindow.expireTuples(SlidingTimeWindow.java:167)
>        at
>
> org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.execute(SlidingTimeWindow.java:329)
>        at
>
> org.drools.common.AbstractWorkingMemory.executeQueuedActions(AbstractWorkingMemory.java:1471)
>        ... 9 more
>
>
> --
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> http://drools-java-rules-engine.46999.n3.nabble.com/Accumulating-over-a-list-of-collected-events-bug-tp2434809p2434809.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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