[jboss-jira] [JBoss JIRA] Commented: (JBRULES-459) Literal constraint using 'null' triggers a NPE.

[Serge Brisson (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-459?page=comments#action_12342362 ] 
            
Serge Brisson commented on JBRULES-459:
---------------------------------------

After further investigation, I can tell you that before the NPE, Result.getValue() has been called twice for the same Result instance, returning a null value each time.

Stack trace of the first call:
	at org.rvpf.rules.BasicResult.getValue(BasicResult.java:92)
	at org.drools.base.org.rvpf.rules.Result$getValue.getValue(Unknown Source)
	at org.drools.base.ClassFieldExtractor.getValue(Unknown Source)
	at org.drools.reteoo.AlphaNodeSwitch.getNode(Unknown Source)
	at org.drools.reteoo.HashedObjectSinkList$1.hasNext(Unknown Source)
	at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)
	at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
	at org.drools.reteoo.Rete.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
	at org.rvpf.rules.ServiceProviderTests.testStatelessSession(ServiceProviderTests.java:132)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.testng.internal.MethodHelper.invokeMethod(MethodHelper.java:552)
	at org.testng.internal.Invoker.invokeMethod(Invoker.java:411)
	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:785)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:114)
	at org.testng.TestRunner.privateRun(TestRunner.java:695)
	at org.testng.TestRunner.run(TestRunner.java:574)
	at org.testng.SuiteRunner.privateRun(SuiteRunner.java:241)
	at org.testng.SuiteRunner.run(SuiteRunner.java:145)
	at org.testng.TestNG.createAndRunSuiteRunners(TestNG.java:901)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:863)
	at org.testng.TestNG.run(TestNG.java:613)
	at org.rvpf.tests.FrameworkTests.main(FrameworkTests.java:132)

Stack trace of the second call:
	at org.rvpf.rules.BasicResult.getValue(BasicResult.java:92)
	at org.drools.base.org.rvpf.rules.Result$getValue.getValue(Unknown Source)
	at org.drools.base.ClassFieldExtractor.getValue(Unknown Source)
	at org.drools.rule.LiteralConstraint.isAllowed(Unknown Source)
	at org.drools.reteoo.AlphaNode.assertObject(Unknown Source)
	at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)
	at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
	at org.drools.reteoo.Rete.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
	at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
	at org.rvpf.rules.ServiceProviderTests.testStatelessSession(ServiceProviderTests.java:132)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.testng.internal.MethodHelper.invokeMethod(MethodHelper.java:552)
	at org.testng.internal.Invoker.invokeMethod(Invoker.java:411)
	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:785)
	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:114)
	at org.testng.TestRunner.privateRun(TestRunner.java:695)
	at org.testng.TestRunner.run(TestRunner.java:574)
	at org.testng.SuiteRunner.privateRun(SuiteRunner.java:241)
	at org.testng.SuiteRunner.run(SuiteRunner.java:145)
	at org.testng.TestNG.createAndRunSuiteRunners(TestNG.java:901)
	at org.testng.TestNG.runSuitesLocally(TestNG.java:863)
	at org.testng.TestNG.run(TestNG.java:613)
	at org.rvpf.tests.FrameworkTests.main(FrameworkTests.java:132)

The NPE occurs after that.


> Literal constraint using 'null' triggers a NPE.
> -----------------------------------------------
>
>                 Key: JBRULES-459
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-459
>             Project: JBoss Rules
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 3.0.4
>         Environment: Windows XP SP2.
>            Reporter: Serge Brisson
>         Assigned To: Edson Tirelli
>             Fix For: 3.0.5
>
>
> The following triggers the problem:
> rule "Drops null results"
>     when
>         $result: Result(value == null)
>     then
>         retract($result);
> end
> Stack trace:
> java.lang.NullPointerException
> 	at org.drools.base.evaluators.ArrayFactory$ArrayEqualEvaluator.evaluate(Unknown Source)
> 	at org.drools.rule.LiteralConstraint.isAllowed(Unknown Source)
> 	at org.drools.reteoo.AlphaNode.assertObject(Unknown Source)
> 	at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)
> 	at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
> 	at org.drools.reteoo.Rete.assertObject(Unknown Source)
> 	at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
> 	at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown Source)
> 	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
> 	at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)
> 	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
> 	at org.drools.jsr94.rules.StatelessRuleSessionImpl.executeRules(Unknown Source)
> 	at org.rvpf.rules.ServiceProviderTests.testStatelessSession(ServiceProviderTests.java:130)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:585)
> 	at org.testng.internal.MethodHelper.invokeMethod(MethodHelper.java:552)
> 	at org.testng.internal.Invoker.invokeMethod(Invoker.java:411)
> 	at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:785)
> 	at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:114)
> 	at org.testng.TestRunner.privateRun(TestRunner.java:695)
> 	at org.testng.TestRunner.run(TestRunner.java:574)
> 	at org.testng.SuiteRunner.privateRun(SuiteRunner.java:241)
> 	at org.testng.SuiteRunner.run(SuiteRunner.java:145)
> 	at org.testng.TestNG.createAndRunSuiteRunners(TestNG.java:901)
> 	at org.testng.TestNG.runSuitesLocally(TestNG.java:863)
> 	at org.testng.TestNG.run(TestNG.java:613)
> 	at org.rvpf.tests.FrameworkTests.main(FrameworkTests.java:132)
> The following is a successful work-around:
> rule "Drops null results"
>     when
>         $result: Result()
>         eval($result.getValue() == null)
>     then
>         retract($result);
> end

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