5 Replies Latest reply on Aug 15, 2011 8:51 PM by tob1as

    Could not find work item handler

    tob1as
    tob1as Aug 10, 2011 2:43 AM

      Hi,

       

      I am trying to send a message through an intermediate message throw event. However, I ve got troubles registering a work item handler for this.

       

      I had a look at the test case in the junit example package testMessageIntermediateThrow().

       

      I copied the Meta-Inf folder in my own project and created my own workItemHandler. I basically just copied the intermediateEvent xml into my bpmn file.

       

      project structure.PNG

       

      The error I get is:

       

      Caused by: java.lang.RuntimeException: unable to execute Action
      Caused by: org.drools.WorkItemHandlerNotFoundException: Could not find work item handler for Send Task

       

      Send Task was the old workItemHandler (in the example), the new one would be MyServiceTaskHandler:

       

      Under Eclipse -> Properties, Action for this intermediateThrowEvent I found this:

       

      org.drools.process.instance.impl.WorkItemImpl workItem = new org.drools.process.instance.impl.WorkItemImpl();
workItem.setName("Send Task");

       

      If I change this to:

      org.drools.process.instance.impl.WorkItemImpl workItem = new org.drools.process.instance.impl.WorkItemImpl();
workItem.setName("MyServiceTaskHandler");
      It changes it back to Send Task immediately when I run the processTest.java. So where exactly is that fetched

       

       

      This is the work definition:

       

      import org.drools.process.core.datatype.impl.type.ObjectDataType;
import org.drools.process.core.datatype.impl.type.StringDataType;

[
  [
    "name" : "MyServiceTask",
    "parameters" : [
        "Message" : new StringDataType()
    ],
    "displayName" : "MyServiceTask",
    "icon" : "icons/arrowright.GIF"
  ]
]

       

       

      This the java in my processTest:

       

      KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("StartProcessWithMessage.bpmn2"), ResourceType.BPMN2);
KnowledgeBase kbase = kbuilder.newKnowledgeBase();

StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
ksession.getWorkItemManager().registerWorkItemHandler("MyServiceTask", new MyServiceTaskHandler());

       

       

      Thx for your help.

       

      Tobi

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      • Categories: jBPM 5.1
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        • 1. Re: Could not find work item handler
          tomcheng76
          tomcheng76 Aug 10, 2011 3:32 AM (in response to tob1as)

          may be you need to check the differences between this example and yours
          http://community.jboss.org/people/bpmn2user/blog/2011/03/28/jbpm5--work-itemdomain-specific-process-hello-process-example

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          • 2. Re: Could not find work item handler
            roxy1987
            roxy1987 Aug 11, 2011 5:05 AM (in response to tob1as)

            You need to add a work item handler for the task.

             

            eg. if it is a human task, WorkItemHandler is added like this :

            ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new WSHumanTaskHandler());

             

            if it is mail node, then WorkItemHandler is defined like this :

            ksession.getWorkItemManager().registerWorkItemHandler("Email", new SystemOutWorkItemHandler());

             

            regards.

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            • 3. Re: Could not find work item handler
              tob1as
              tob1as Aug 11, 2011 5:15 AM (in response to roxy1987)

              Thanks for your help.

               

              I did that before, like this:

               

              ksession.getWorkItemManager().registerWorkItemHandler("MyServiceTask", new MyServiceTaskHandler());

               

              I also wrote the handler class. However, it is still looking for the wrong handler.

               

              When I open the bpmn file in eclipse and check for the connected action entry for this particular task, it shows

               

              org.drools.process.instance.impl.WorkItemImpl workItem = new org.drools.process.instance.impl.WorkItemImpl();
              workItem.setName("Send Task");

               

              When I change the setName function to MyServiceTask and reopen the bpmn file, it changes it back. So it must fetch this from somewhere ...

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              • 4. Re: Could not find work item handler
                roxy1987
                roxy1987 Aug 11, 2011 6:39 AM (in response to tob1as)

                Yeah. Sounds about right. I may have to get back on that.

                 

                Regards.

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                • 5. Re: Could not find work item handler
                  tob1as
                  tob1as Aug 15, 2011 8:51 PM (in response to roxy1987)

                  Could it be, that the intermediate throw event has to be registered for "Send Task" ?

                   

                  //This works

                  ksession.getWorkItemManager().registerWorkItemHandler("Send Task", new SendTaskHandler());

                   

                  //This works

                  ksession.getWorkItemManager().registerWorkItemHandler("Send Task", new MyOwnIntermediateThrowHandler());

                   

                  //Does not work

                  ksession.getWorkItemManager().registerWorkItemHandler("Blub!", new MyOwnIntermediateThrowHandler());

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