Entered JBRULES-2887. But I find that there must be another pattern
when SomePatternHereREquiredToCausetheNPE(...) $list : List() from collect ( A() over window:time(5s) ) Number($avg : doubleValue) from accumulate( A($num : num) from $list, average($num)) then -W On 6 February 2011 09:34, Wolfgang Laun <wolfgang.l...@gmail.com> wrote: > 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.ro...@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 >> >> >> -- >> View this message in context: >> 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. >> _______________________________________________ >> rules-users mailing list >> rules-users@lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> > >
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