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@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@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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