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  1. Drools
  2. DROOLS-7630

PhreakAccumulateNode will trigger "accctx" NullPointerException when fireAll Rules for some cases

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    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Critical Critical
    • None
    • 7.74.1.Final, 8.44.0.Final
    • core engine, dmn engine
    • None
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      1.To reproduce, run the use case tests in attached projects of the ticket, then see the error message.

      The "accctx"NullPointerException happened in Drools 8.44.Final and Drools 7.74.1.Final.

      Note: the test reports "tuple" is null when run in  Drools 7.73.0.Final.
       

      java.lang.NullPointerException: Cannot invoke "org.drools.core.reteoo.AccumulateNode$BaseAccumulation.setPropagationContext(org.drools.core.common.PropagationContext)" because "accctx" is null   at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:728) at org.drools.core.phreak.PhreakAccumulateNode.doRightUpdatesProcessChildren(PhreakAccumulateNode.java:486) at org.drools.core.phreak.PhreakAccumulateNode.doRightUpdates(PhreakAccumulateNode.java:445) at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:74) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:595) ..........
 

       

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      1.To reproduce, run the use case tests in attached projects of the ticket, then see the error message. The "accctx"NullPointerException happened in Drools 8.44.Final and Drools 7.74.1.Final. Note: the test reports "tuple" is null when run in  Drools 7.73.0.Final.   java.lang.NullPointerException: Cannot invoke "org.drools.core.reteoo.AccumulateNode$BaseAccumulation.setPropagationContext(org.drools.core.common.PropagationContext)" because "accctx" is null   at org.drools.core.phreak.PhreakAccumulateNode.addMatch(PhreakAccumulateNode.java:728) at org.drools.core.phreak.PhreakAccumulateNode.doRightUpdatesProcessChildren(PhreakAccumulateNode.java:486) at org.drools.core.phreak.PhreakAccumulateNode.doRightUpdates(PhreakAccumulateNode.java:445) at org.drools.core.phreak.PhreakAccumulateNode.doNode(PhreakAccumulateNode.java:74) at org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:595) ..........    
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      The test cases come from our business scenarios,
      More descriptions about the DRL file in case:
      In digital commerce, we implement one rule as followings business purpose :

      If customers buy some products in cart, we will give the qualified products some discount and consume the left-quantity of the qualified products until the left-quantity to be 0.

      1. We allow the rule to be executed more than one time, so the "no-loop" to be false.
      2. For the when parts of the Drl, we add the check to test whether the products (that has left-quantity>0) exists in cart.
      3.Also we add the "filter" parts in accumulate to filter the qualified(belong the "575" category) products , and the qualified products will be passed into action part of the DRL,  and  qualified products can be consumed by reducing the left-quantity and generate discount actions as code shows. 

       

        1. pocusecaseOfdrl-main.zip
          23 kB

              mfusco@redhat.com Mario Fusco
              cris.li01@sap.com cris li (Inactive)
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                Created:
                Updated:
                Resolved: