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Execution with id $FOO does not have a subscription to a message event with name $BAR

Question asked by mindcrime on Apr 26, 2013
Latest reply on Apr 29, 2013 by mindcrime
I have a simple process that looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="" xmlns:xsi="" xmlns:activiti="" xmlns:bpmndi="" xmlns:omgdc="" xmlns:omgdi="" typeLanguage="" expressionLanguage="" targetNamespace="">
  <message id="message1" name="message1"></message>
  <process id="sampleProcess1" name="Sample Process 1">
    <startEvent id="startevent1" name="Start"></startEvent>
    <serviceTask id="servicetask1" name="Service Task" activiti:async="true" activiti:exclusive="false" activiti:class="org.example.activiti.service.ServiceClass1"></serviceTask>
    <userTask id="usertask1" name="User Task"></userTask>
    <intermediateCatchEvent id="messageintermediatecatchevent1" name="MessageCatchEvent">
      <messageEventDefinition messageRef="message1"></messageEventDefinition>
    <exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
    <endEvent id="endevent1" name="End"></endEvent>
    <serviceTask id="servicetask2" name="Service Task" activiti:class="org.example.activiti.service.ServiceClass2"></serviceTask>
    <scriptTask id="scripttask1" name="Script Task" scriptFormat="groovy">
      <script><![CDATA[println( "resuming after receiving message1 event" );]]></script>
    <scriptTask id="scripttask2" name="Script Task" scriptFormat="groovy">
      <script><![CDATA[println( "Flow NOT altered" );]]></script>
    <scriptTask id="scripttask3" name="Script Task" scriptFormat="groovy">
    <sequenceFlow id="flow1" name="" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow2" name="" sourceRef="servicetask1" targetRef="usertask1"></sequenceFlow>
    <sequenceFlow id="flow4" name="" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
    <sequenceFlow id="flow5" name="" sourceRef="exclusivegateway1" targetRef="scripttask2">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${alterFlowFlag == false}]]></conditionExpression>
    <sequenceFlow id="flow6" name="" sourceRef="exclusivegateway1" targetRef="scripttask3">
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${alterFlowFlag == true}]]></conditionExpression>
    <sequenceFlow id="flow7" name="" sourceRef="messageintermediatecatchevent1" targetRef="scripttask1"></sequenceFlow>
    <sequenceFlow id="flow8" name="" sourceRef="scripttask1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow9" name="" sourceRef="scripttask2" targetRef="endevent1"></sequenceFlow>
    <sequenceFlow id="flow10" name="" sourceRef="scripttask3" targetRef="servicetask2"></sequenceFlow>

The goal is to alter the execution after the completion of the user task, based on the receipt of an external message.  So we have some Java code that will locate the process instance based on a variable set by ServiceClass1, and then inject a flag we use in the Exclusive Gateway that comes after the User Task.  If the flag is false, we simply proceed as normal, if it's true we want to do something different.

That part works as expected.

What doesn't work is this: In ServiceClass2, which comes after the UserTask in the "special case" we send a message, which we expect to cause execution to pick up at the Message Intermediate Catching Event.  The code in question is very simple and looks like this:

   public void execute( DelegateExecution exec ) throws Exception {
      ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
      RuntimeService runtimeService = engine.getRuntimeService();
      runtimeService.messageEventReceived("message1", exec.getId(), null );

But when we send that message, Activiti gives us the error:

org.activiti.engine.ActivitiException: Execution with id '24801' does not have a subscription to a message event with name 'message1'

Is there something I'm missing here?