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  1. Drools
  2. DROOLS-4864

accumulate causes NullPointerException

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

      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)

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