[rules-users] Possibly Broken drools-core-5.4.0.Final.jar?

[Darin Wilcox]

Hello all,

I have an application that was written originally using Drools 5.3.1.Final
that works just fine.  I wrote a JUnit test that runs through values
contained in a spreadsheet.  Everything was working great.  I updated the
application to use Drools 5.4.0.Final and then the test stopped working.  I
have debugged the code and here is the exception thrown:

Exception executing consequence for rule "create vcmax" in
org.zoikks.drools: java.lang.NullPointerException
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
 at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1283)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1209)
 at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1442)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
 at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
 at
org.zoikks.drools.xlsx.SampleWorkflowXlsx.check(SampleWorkflowXlsx.java:103)
at
org.zoikks.drools.xlsx.SampleWorkflowXlsx.testSampleXlsxSheets(SampleWorkflowXlsx.java:77)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
 at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
 at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
 at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
 at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
 at junit.framework.TestSuite.run(TestSuite.java:238)
at
org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
 at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
 at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.lang.NullPointerException
at ConditionEvaluator0f64b1c63942476d80eb29d1cdffda28.evaluate(Unknown
Source)
at
org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:167)
 at
org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:124)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)
 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:337)
at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)
 at
org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)
at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:187)
 at
org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:181)
at
org.zoikks.drools.Rule_create_vcmax_692832fd6e0547e09b6f632175df45ff.defaultConsequence(Rule_create_vcmax_692832fd6e0547e09b6f632175df45ff.java:7)
 at
org.zoikks.drools.Rule_create_vcmax_692832fd6e0547e09b6f632175df45ffDefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
org.zoikks.drools.Rule_create_vcmax_692832fd6e0547e09b6f632175df45ffDefaultConsequenceInvoker.evaluate(Unknown
Source)
 at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1273)
... 26 more

This appears to be a race-condition occurring someplace within the app
because it executes find some times, yet other times a NPE is thrown.  The
location where the exception is originating is new to Drools 5.4.0.Final so
there is nothing to compare against in previous versions.  Has anyone else
seen this and/or does anyone know how to solve this problem?

I have attached code that is using Drools 5.4.0.Final.  To successfully
re-produce the problem, place a breakpoint at
org.drools.rule.constraint.MvelConstraint.evaluate() [Line 167] and then
step through.  The exception has been occurring continuously.

Thanks,

- Darin
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