I recently upgraded from 5.2.0 Final to 5.3.0 CR1 because I was experiencing
memory leaks in 5.2.0 Final due to a known bug that was fixed in 5.3.0 CR1.
I have a suite of FitNesse tests that exercise the majority of my rules and
flows, and I can demonstrate that the memory leak is indeed fixed, but one
of my tests is now failing.  If I revert back to 5.2.0 Final, all is well.

I've been trying to determine the root cause for the past 3 days, but I'm
not getting anywhere.  I suspect that it's related to an interaction between
2 rules, e.g. one rule modifies something that causes the second rule to
fire, but the second rule chokes in the consequence when it tries to execute
a modify() statement.  If I comment out the modify portion, the rule fires
fine.

I wish I could provide an example, but my implementation is too complex for
that and I haven't been able to reproduce it in a stand-alone example.

I know a stack trace probably won't tell you much, but I've included it
below just in case.  If anyone has any ideas, I'd love to hear them.  If
there's any additional information you think might help diagnose the
problem, I'd be happy to provide it.

Thanks,
Jamie

org.drools.runtime.rule.ConsequenceException: rule: Rule 022 - Load Buyer
Activity

       at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
       at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
       at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
       at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
       at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:708)
       at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:672)
       at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
       at
com.llbean.fraud.rule.engine.DroolsRulesEngine.invokeRules(DroolsRulesEngine.java:119)
       at
com.llbean.fraud.rule.engine.DroolsRulesEngine.invokeRules(DroolsRulesEngine.java:81)
       at
com.llbean.fraud.fitnesse.fixtures.tests.TestFraudRules.execute(TestFraudRules.java:116)
       at fit.ColumnFixture.executeIfNeeded(ColumnFixture.java:57)
       at fit.ColumnFixture.check(ColumnFixture.java:46)
       at fit.Binding$QueryBinding.doCell(Binding.java:188)
       at fit.ColumnFixture.doCell(ColumnFixture.java:37)
       at fit.Fixture.doCells(Fixture.java:171)
       at fit.Fixture.doRow(Fixture.java:165)
       at fit.ColumnFixture.doRow(ColumnFixture.java:25)
       at fit.Fixture.doRows(Fixture.java:159)
       at fit.ColumnFixture.doRows(ColumnFixture.java:18)
       at fit.Fixture.doTable(Fixture.java:153)
       at fit.Fixture.interpretFollowingTables(Fixture.java:119)
       at fit.Fixture.interpretTables(Fixture.java:105)
       at fit.Fixture.doTables(Fixture.java:79)
       at
com.llbean.test.fitnesse.servletrunner.server.LLBFitServer.process(LLBFitServer.java:120)
       at
com.llbean.test.fitnesse.servletrunner.server.LLBFitServer.runTests(LLBFitServer.java:40)
       at
com.llbean.test.fitnesse.servletrunner.servlet.FitServlet.service(FitServlet.java:32)
       at
com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1530)
       at
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:829)
       at
com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:458)
       at
com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:175)
       at
com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91)
       at
com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:862)
       at
com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583)
       at
com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:178)
       at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:455)
       at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:384)
       at
com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:272)
       at
com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
       at
com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
       at
com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
       at
com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
       at
com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
       at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
       at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
       at
com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
       at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
       at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550)
Caused by: java.lang.NullPointerException
       at
org.drools.reteoo.RuleTerminalNode.createActivations(RuleTerminalNode.java:276)
       at
org.drools.reteoo.RuleTerminalNode.modifyLeftTuple(RuleTerminalNode.java:326)
       at
org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:273)
       at
org.drools.reteoo.EvalConditionNode.modifyLeftTuple(EvalConditionNode.java:234)
       at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyChildLeftTuple(CompositeLeftTupleSinkAdapter.java:295)
       at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:380)
       at org.drools.reteoo.BetaNode.modifyLeftTuple(BetaNode.java:450)
       at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:446)
       at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateModifyObject(CompositeLeftTupleSinkAdapter.java:260)
       at
org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyObject(CompositeLeftTupleSinkAdapter.java:275)
       at
org.drools.reteoo.LeftInputAdapterNode.modifyObject(LeftInputAdapterNode.java:174)
       at
org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:461)
       at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:429)
       at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:277)
       at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:271)
       at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:459)
       at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:363)
       at
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:298)
       at
com.llbean.droolstest.Rule_Rule_022___Load_Buyer_Activity.defaultConsequence(Rule_Rule_022___Load_Buyer_Activity.java:15)
       at
com.llbean.droolstest.Rule_Rule_022___Load_Buyer_ActivityDefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
       at
com.llbean.droolstest.Rule_Rule_022___Load_Buyer_ActivityDefaultConsequenceInvoker.evaluate(Unknown
Source)
       at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
       ... 45 more


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