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  1. Drools
  2. DROOLS-4864

accumulate causes NullPointerException

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Details

    • Bug
    • Resolution: Done
    • Blocker
    • None
    • 7.30.0.Final
    • None
    • 2019 Week 50-52 (from Dec 9)
    • Hide

      Object class:

      public class InstrumentStateEvent {

    private String instrument;
    private int state;

    public InstrumentStateEvent() {
    }

    public InstrumentStateEvent(String instrument, int state) {
        this.instrument = instrument;
        this.state = state;
    }

    public String getInstrument() {
        return instrument;
    }

    public void setInstrument(String instrument) {
        this.instrument = instrument;
    }

    public int getState() {
        return state;
    }

    public void setState(int state) {
        this.state = state;
    }
}

      Rule that causes NullPointerException on removal:

      rule "instrument_state_event_rule"
    no-loop
when
    $max : Integer() from accumulate(
            InstrumentStateEvent( $p : state, instrument == "non_existing_instrument" ),
            max( $p ))
then
        // smth
end

      Another rule with different accumulate syntax, which also causes the same exception:

      rule "alternative_instrument_state_event_rule"
    no-loop
when
    accumulate(
            InstrumentStateEvent( $p : state, instrument == "non_existing_instrument" );
            $max : max( $p ))
then
        // smth
end
      Show
      Object class: public class InstrumentStateEvent { private String instrument; private int state; public InstrumentStateEvent() { } public InstrumentStateEvent( String instrument, int state) { this .instrument = instrument; this .state = state; } public String getInstrument() { return instrument; } public void setInstrument( String instrument) { this .instrument = instrument; } public int getState() { return state; } public void setState( int state) { this .state = state; } } Rule that causes NullPointerException on removal: rule "instrument_state_event_rule" no-loop when $max : Integer () from accumulate( InstrumentStateEvent( $p : state, instrument == "non_existing_instrument" ), max( $p )) then // smth end Another rule with different accumulate syntax, which also causes the same exception: rule "alternative_instrument_state_event_rule" no-loop when accumulate( InstrumentStateEvent( $p : state, instrument == "non_existing_instrument" ); $max : max( $p )) then // smth end
    • NEW
    • NEW

    Description

      NullPointerException is thrown in AddRemoveRule::iterateLeftTuple when removing a rule that contains accumulate with max function and a source pattern that matches no object. 

      Caused by: java.lang.NullPointerException
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.iterateLeftTuple(AddRemoveRule.java:1040)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.iterateLeftTuple(AddRemoveRule.java:1047)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.iterateLeftTuple(AddRemoveRule.java:1053)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.iterateLeftTuple(AddRemoveRule.java:1053)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.visitChild(AddRemoveRule.java:969)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.lambda$processLeftTuples$1(AddRemoveRule.java:927)
	at deployment.my-full-bundle.ear//org.drools.core.common.DefaultFactHandle$SingleLinkedTuples.forEachLeftTuple(DefaultFactHandle.java:728)
	at deployment.my-full-bundle.ear//org.drools.core.common.DefaultFactHandle.forEachLeftTuple(DefaultFactHandle.java:924)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.processLeftTuples(AddRemoveRule.java:922)
	at deployment.my-full-bundle.ear//org.drools.core.phreak.AddRemoveRule.removeRule(AddRemoveRule.java:178)
	at deployment.my-full-bundle.ear//org.drools.core.reteoo.ReteooBuilder.removeTerminalNode(ReteooBuilder.java:191)
	at deployment.my-full-bundle.ear//org.drools.core.reteoo.ReteooBuilder.removeRules(ReteooBuilder.java:177)
	at deployment.my-full-bundle.ear//org.drools.core.impl.KnowledgeBaseImpl.removeObjectsGeneratedFromResource(KnowledgeBaseImpl.java:1735)
	at deployment.my-full-bundle.ear//org.drools.compiler.builder.impl.KnowledgeBuilderImpl.removeObjectsGeneratedFromResource(KnowledgeBuilderImpl.java:2151)
	at deployment.my-full-bundle.ear//org.drools.compiler.kie.builder.impl.KieBaseUpdater.removeResources(KieBaseUpdater.java:121)
	at deployment.my-full-bundle.ear//org.drools.compiler.kie.builder.impl.KieBaseUpdater.run(KieBaseUpdater.java:66)
	at deployment.my-full-bundle.ear//org.drools.core.impl.KnowledgeBaseImpl.enqueueModification(KnowledgeBaseImpl.java:745)
	at deployment.my-full-bundle.ear//org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:267)
	at deployment.my-full-bundle.ear//org.drools.compiler.kie.builder.impl.KieContainerImpl.update(KieContainerImpl.java:237)
	at deployment.my-full-bundle.ear//org.drools.compiler.kie.builder.impl.KieContainerImpl.updateToVersion(KieContainerImpl.java:195)
	at deployment.my-full-bundle.ear.rules-comp-impl.jar//com.my.rules.RuleKnowledgeBase.removeRuleFromKnowledgeBase(RuleKnowledgeBase.java:481)

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          is caused by

          Bug - A problem that impairs or prevents the functions of the product. DROOLS-3554 KieContainer#updateToVersion removing rules with accumulate

          • 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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              mfusco@redhat.com Mario Fusco
              vpriscan Vedran Prišćan (Inactive)
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                Created:
                Updated:
                Resolved: