Re: [rules-users] Fusion: Null pointer exception when using sliding windows

The missing ":" was just a typo in my transcribing. I'm running my code in a virtual machine so I couldn't copy and paste and have to hand type everything out. I go through and check the knowledge builder for errors by checking the size of KnowledgeBuilder.getErrors() and if the size is greater then 0, display the error. However nothing comes up. I'm running Drools 5.5.0.Final that I just downloaded recently. the DRL I'm using consists of: package testing2; import test2.*; import java.util.*; import org.drools.*; declare Foo @role(event) @timestamp(Start) @duration(Duration) end rule test when $primary : Foo($name : Name) over window:length(24) $prev : ArrayList(size<1) from collect ( Foo(Name == $name, this before $primary)) then System.out.println("Found name: " + $name); end The error in the console that gets spit back out is: java.land.NullPointerException at org.drools.core.util.index.RightTupleIndexHashTable.remove (RightTupleIndexHashTable.java : 363) at org.drools.reteoo.AccumulateNode.retractRightTuple (AccumulateNode.java : 318) at org.drools.rule.SlidingLengthWindow.assertFact (SlidingLengthWindow.java : 116) at org.drools.rule.BehaviorManager.assertFact (BehaviorManager.java : 94) at org.drools.reteoo.WindowNode.assertObject (WindowNode.java : 167) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject (CompositeObjectSinkAdapter.java : 497) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject (CompositeObjectSinkAdapter.java : 382) at org.drools.reteoo.ObjectTypeNode.assertObject (ObjectTypeNode.java : 235) at org.drools.reteoo.EntryPointNode.assertObject (EntryPointNode.java : 240) at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 350) at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 311) at org.drools.common.AbstractWorkingMemory.insert (AbstractWorkingMemory.java : 903) at org.drools.common.AbstractWorkingMemory.insert (AbstractWorkingMemory.java : 847) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java : 269) at test2.Engine2.main (ngine2.java : 78) that last line points to my main class where I add the events into the knowledge session. When I change "over window:length(24)" to "over window:time(21d)" (my sample data is about 22 days old now) I get the error: org.drools.RuntimeDroolsException : Unexpected exception executing action org.drools.rule.SlidingTimeWIndow$BehaviorExpireWMAction@491cc367 at org.drools.common.AbstractWorkingMemory.executeQueuedActions (AbstractWorkingMemory.java : 995) at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.java : 362) at org.drools.common.NamedEntryPoint.insert (NamedEntryPoint.jaba : 311) at org.drools.common.AbstractWorkingMemory.insert (AbstractWorkingMemory.java : 903) at org.drools.common.AbstractWorkingMemory.insert (AbstractWorkingMemory.java : 847) at org.drools.impl.StatefulKnowledgeSessionImpl.insert (StatefulKnowledgeSessionImpl.java : 269) at test2.Engine2.main (Engine2.java : 78) Caused by: java.lang.NullPointerException at org.drools.core.util.index.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java : 363) at org.drools.reteoo.AccumulateNode.retractRightTuple (AccumulateNode.java : 318) at org.drools.rule.SlidingTimeWindow.expireFacts(SlidingTimeWindow.java : 189) at org.drools.rule.SlidingTimeWindow$BehaviorExpireWMAction.execute (SlidingTimeWindow.java : 471) at org.drools.common.AbstractWorkingMemory.executeQueuedActions (AbstractWorkingMemory.java : 993) ... 6 more When I get rid of any over window statements, everything runs just fine. -- View this message in context: http://drools.46999.n3.nabble.com/Fusion-Null-pointer-exception-when-usin... Sent from the Drools: User forum mailing list archive at Nabble.com.