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  1. camunda BPM
  2. CAM-5120

Execution-End-Listener is invoked twice inside parallel multi instance

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      Pre-condition:
      Deploy a process with a parallel multi instance sub process. This sub process contains a task with a execution-end-listener:

      <subProcess id="messageSubprocessLoop">

  <multiInstanceLoopCharacteristics>
    <loopCardinality xsi:type="tFormalExpression">2</loopCardinality>
  </multiInstanceLoopCharacteristics>

  <startEvent id="StartEvent_1" />

  <sequenceFlow sourceRef="StartEvent_1" targetRef="task" />

  <receiveTask id="task" messageRef="Message_1">
    <extensionElements>
      <camunda:executionListener class="org.my.company.MyListener" event="end"/>
    </extensionElements>
  </receiveTask>

  <sequenceFlow sourceRef="task" targetRef="EndEvent_1"/>

  <endEvent id="EndEvent_1" />

</subProcess>

      Start an instance of the process, so that there are two tasks: receiveTask1 and receiveTask2. And there are two threads t1 and t2. t1 correlates a message against receiveTask1 and t2 correlates a message against receiveTask2 in parallel.

      Problem:
      1) Both threads t1 and t2 fetch the current execution tree.
      2) t1 signals receiveTask1 -> execution-end-listener is invoked
      3) t2 signals receiveTask2 -> execution-end-listener is invoked
      4) t1 executes end event inside parallel multi instance sub process
      5) t2 executes end event inside parallel multi instance sub process
      6) t1 calls ParallelMultiInstanceActivityBehavior#concurrentChildExecutionEnded()
      – the variable nrOfActiveInstances is set to 1
      7) t1 flushes and commits its changes
      8) t2 calls ParallelMultiInstanceActivityBehavior#concurrentChildExecutionEnded()
      – fetch the variable nrOfActiveInstances (value is 1)
      – decrement nrOfActiveInstances (value is 0)
      – for each concurrent child execution deleteCascade is invoked -> execution-end-listener of receiveTask1 is invoked

      Expected behavior:
      The execution-end-listener of receiveTask1 is not invoked in step 8.

        This is the controller panel for Smart Panels app

              thorben.lindhauer Thorben Lindhauer
              roman.smirnov Roman Smirnov
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                Created:
                Updated:
                Resolved: