[rules-users] NPE exception when retracting fact in Drools 5.5.0.Final and 5.3.0.Final

[Mark Proctor]

5.6 is pretty much ready to go, someone just has to build it and upload binaries. I'd recommend you build 5.6 and try those binaries.

Mark
On 15 Oct 2013, at 18:53, "Bransford-Koons, Geoff" <Geoff.Bransford-Koons at Teradata.com> wrote:

> I’m trying to update our application from Drools 4.0.7 to Drools 5.5 (or 5.3 if that’s better).
>  
> All the rules compile and I am serializing the KnowledgeBase and reading it in upon application start-up.
>  
> Inserting facts works find.  Retracting can often return the NullPointerException shown below.  That clip comes from a unit test that literally just inserts 10 “TestFact” objects and then tries to retract them one at a time.  No rule firing happens, just insertion and retraction.  I did try adding a rule firing in between the insert and retraction loops but it made no difference.  These “TestFact” object don’t actually trigger any rules if that matters.
>  
> I’ve tried this with both the Drools 5.5.0.Final and 5.3.0.Final jars with the same results.  Searches on the forum and on Google show this as a bug in 5.5.0.Final, but say it should work in 5.3.0.Final.  It doesn’t work on either for me.
>  
> I am going to try some variations on this test, but it seems like this should work as-is. 
>  
> Any suggestions would be greatly appreciated.
>  
> 2013-10-14 11:56:02,533 (ERROR) [AgdKnowledgeSession] caught exception trying to retract TestFact [name=testfact-0]
> java.lang.NullPointerException
>        at org.drools.core.util.RightTupleIndexHashTable.remove(RightTupleIndexHashTable.java:365)
>        at org.drools.reteoo.NotNode.retractRightTuple(NotNode.java:172)
>        at org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:257)
>        at org.drools.reteoo.EntryPointNode.retractObject(EntryPointNode.java:330)
>        at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:542)
>        at org.drools.common.NamedEntryPoint.retract(NamedEntryPoint.java:486)
>        at com.teradata.agd.AgdKnowledgeSession.retract(AgdKnowledgeSession.java:134)
>        at com.teradata.agd.AgCoreManager.executeFactEvent(AgCoreManager.java:279)
>        at com.teradata.agd.AgCoreManager.executeRuleEngine(AgCoreManager.java:189)
>        at com.teradata.agd.AgCoreManager.enqueue(AgCoreManager.java:259)
>        at com.teradata.agd.AgCoreManager.retractFact(AgCoreManager.java:480)
>        at com.teradata.agdtest.functional.FactInsertionAndRetractionTest.testFactInsertion(FactInsertionAndRetractionTest.java:50)
>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>        at java.lang.reflect.Method.invoke(Unknown Source)
>        at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
>        at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
>        at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
>        at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
>        at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
>        at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
>        at org.testng.TestRunner.privateRun(TestRunner.java:767)
>        at org.testng.TestRunner.run(TestRunner.java:617)
>        at org.testng.SuiteRunner.runTest(SuiteRunner.java:335)
>        at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:330)
>        at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
>        at org.testng.SuiteRunner.run(SuiteRunner.java:240)
>        at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
>        at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
>        at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
>        at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
>        at org.testng.TestNG.run(TestNG.java:1057)
>        at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
>        at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
>        at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)
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