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

[Serge Brisson (JIRA)]

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: Mark Proctor


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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