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  1. Drools
  2. DROOLS-6699

ClassCastException in groupBy with executable model and two sessions in parallel

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Details

    • Bug
    • Resolution: Done
    • Major
    • None
    • None
    • core engine
    • None
    • 2021 Week 43-45 (from Oct 25)
    • Hide

      Clone this: https://github.com/triceo/optaplanner-class-cast-issue/tree/reproducer
      Then "cd vng-schedule && ./gradlew build run"

      The loop will run until the problem is successfully reproduced. Usually it doesn't take more than 10 iterations.

      Show
      Clone this: https://github.com/triceo/optaplanner-class-cast-issue/tree/reproducer Then "cd vng-schedule && ./gradlew build run" The loop will run until the problem is successfully reproduced. Usually it doesn't take more than 10 iterations.
    • NEW
    • NEW

    Description

      Caused by: java.lang.ClassCastException: class vngschedules.schedule.Student cannot be cast to class [Ljava.lang.Object; (vngschedules.schedule.Student is in unnamed module of loader 'app'; [Ljava.lang.Object; is in module java.base of loader 'bootstrap')
        at org.drools.core.base.extractors.ArrayElementReader.getValue(ArrayElementReader.java:162)
        at org.drools.core.base.extractors.ArrayElementReader.getValue(ArrayElementReader.java:279)
        at org.drools.modelcompiler.KiePackagesBuilder.lambda$getBindingFunction$66de2761$1(KiePackagesBuilder.java:789)
        at org.drools.modelcompiler.constraints.LambdaReadAccessor.getValue(LambdaReadAccessor.java:42)
        at org.drools.core.rule.Declaration.getValue(Declaration.java:258)
        at org.optaplanner.core.impl.score.stream.drools.common.AbstractAccumulator.extractValue(AbstractAccumulator.java:42)
        at org.optaplanner.core.impl.score.stream.drools.common.BiAccumulator.accumulate(BiAccumulator.java:55)
        at org.drools.core.rule.SingleAccumulate.accumulate(SingleAccumulate.java:96)
        at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:736)
        at org.drools.core.phreak.PhreakAccumulateNode.doRightInserts(PhreakAccumulateNode.java:253)
        at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:99)
        at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:591)
        at org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:558)
        at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:385)
        at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:345)
        at org.drools.core.phreak.RuleNetworkEvaluator.evalStackEntry(RuleNetworkEvaluator.java:243)
        at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:186)
        at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:139)
        at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:235)
        at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:91)
        at org.drools.core.concurrent.AbstractRuleEvaluator.internalEvaluateAndFire(AbstractRuleEvaluator.java:33)
        at org.drools.core.concurrent.SequentialRuleEvaluator.evaluateAndFire(SequentialRuleEvaluator.java:43)
        at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:789)
        at org.drools.core.common.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:736)
        at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:728)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl.internalFireAllRules(StatefulKnowledgeSessionImpl.java:1344)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1335)
        at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1327)

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          causes

          Bug - A problem that impairs or prevents the functions of the product. PLANNER-2565 ClassCastException in complex constraint with groupBy() and flattenLast()

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

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            People

              mfusco@redhat.com Mario Fusco
              lpetrovi@redhat.com Lukáš Petrovický (Inactive)
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                Created:
                Updated:
                Resolved: