[jboss-jira] [JBoss JIRA] (DROOLS-1686) NPE using drools accumulate function in fairness constraint (tennis example)

[Geoffrey De Smet (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-1686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Geoffrey De Smet moved PLANNER-845 to DROOLS-1686:
--------------------------------------------------

              Project: Drools  (was: OptaPlanner)
                  Key: DROOLS-1686  (was: PLANNER-845)
          Component/s: core engine
                           (was: optaplanner-examples)
    Affects Version/s: 7.1.0.Final
                           (was: 7.1.0.Final)


> NPE using drools accumulate function in fairness constraint (tennis example)
> ----------------------------------------------------------------------------
>
>                 Key: DROOLS-1686
>                 URL: https://issues.jboss.org/browse/DROOLS-1686
>             Project: Drools
>          Issue Type: Bug
>          Components: core engine
>    Affects Versions: 7.1.0.Final
>         Environment: openjdk version "1.8.0_131"
> OpenJDK Runtime Environment (build 1.8.0_131-b11)
> OpenJDK 64-Bit Server VM (build 25.131-b11, mixed mode)
>            Reporter: Markus Müller
>            Assignee: Mario Fusco
>         Attachments: TennisConstraintsTest.java
>
>
> Using the LoadBalanceAccumulateFunction found in tennis example for modelling fairness constraints leads to NPE in drools itself, in FromNodeLeftTuple.java:
> {code}
> Caused by: java.lang.NullPointerException
>     at org.drools.core.reteoo.FromNodeLeftTuple.getAccumulatedObjects(FromNodeLeftTuple.java:98)
> {code}
> Full stacktrace:
> {code:java}
> Exception executing consequence for rule "fairAssignmentCountPerTeam" in org.optaplanner.examples.tennis.solver: java.lang.NullPointerException
>     at org.drools.core.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
>     at org.drools.core.common.DefaultAgenda.handleException(DefaultAgenda.java:1252)
>     at org.drools.core.phreak.RuleExecutor.innerFireActivation(RuleExecutor.java:438)
>     at org.drools.core.phreak.RuleExecutor.fireActivation(RuleExecutor.java:379)
>     at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:135)
>     at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:88)
>     at org.drools.core.concurrent.AbstractRuleEvaluator.internalEvaluateAndFire(AbstractRuleEvaluator.java:34)
>     at org.drools.core.concurrent.SequentialRuleEvaluator.evaluateAndFire(SequentialRuleEvaluator.java:43)
>     at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1068)
>     at org.drools.core.common.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:1015)
>     at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1007)
>     at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1320)
>     at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1311)
>     at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1295)
>     at org.optaplanner.core.impl.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:117)
>     at org.optaplanner.test.impl.score.AbstractScoreVerifier.assertWeight(AbstractScoreVerifier.java:82)
>     at org.optaplanner.test.impl.score.buildin.hardmediumsoft.HardMediumSoftScoreVerifier.assertSoftWeight(HardMediumSoftScoreVerifier.java:107)
>     at org.optaplanner.test.impl.score.buildin.hardmediumsoft.HardMediumSoftScoreVerifier.assertSoftWeight(HardMediumSoftScoreVerifier.java:94)
>     at org.optaplanner.examples.tennis.TennisConstraintsTest.fairAssignmentCountPerTeam(TennisConstraintsTest.java:40)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:498)
>     at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
>     at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
>     at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
>     at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
>     at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
>     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
>     at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
>     at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
>     at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
>     at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
>     at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
>     at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
>     at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
>     at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
>     at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
>     at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:51)
>     at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
>     at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
> Caused by: java.lang.NullPointerException
>     at org.drools.core.reteoo.FromNodeLeftTuple.getAccumulatedObjects(FromNodeLeftTuple.java:98)
>     at org.drools.core.common.AgendaItem.getObjectsDeep(AgendaItem.java:78)
>     at org.drools.core.reteoo.RuleTerminalNodeLeftTuple.getObjectsDeep(RuleTerminalNodeLeftTuple.java:359)
>     at org.optaplanner.core.api.score.holder.AbstractScoreHolder.extractJustificationList(AbstractScoreHolder.java:118)
>     at org.optaplanner.core.api.score.holder.AbstractScoreHolder.registerConstraintMatch(AbstractScoreHolder.java:88)
>     at org.optaplanner.core.api.score.buildin.hardmediumsoft.HardMediumSoftScoreHolder.addMediumConstraintMatch(HardMediumSoftScoreHolder.java:69)
>     at org.optaplanner.examples.tennis.solver.Rule_fairAssignmentCountPerTeam1005511081.defaultConsequence(Rule_fairAssignmentCountPerTeam1005511081.java:21)
>     at org.optaplanner.examples.tennis.solver.Rule_fairAssignmentCountPerTeam1005511081DefaultConsequenceInvokerGenerated.evaluate(Unknown
> Source)
>     at org.optaplanner.examples.tennis.solver.Rule_fairAssignmentCountPerTeam1005511081DefaultConsequenceInvoker.evaluate(Unknown
> Source)
> at org.drools.core.phreak.RuleExecutor.innerFireActivation(RuleExecutor.java:431)
> ... 38 more 
> {code}
> See also related discussion in: https://groups.google.com/forum/#!topic/optaplanner-dev/xA6IdGieDpU



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