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