Striving to invoke a Java Method via a Service Task in JBPM 6

[tujasiri]

I'm striving to invoke a method from a service task. I've followed a few suggestions and examples, mainly Maciej Swiderski's-->HERE. I think everything set up correctly, for the most part, but my custom method is not being called.

I've:

• created the class with will execute my "task"
• created the necessary conf, and wid files
• registered my WorkItemHandler (and the executeWorkItem method is invoked)

And here are BPMN file contents:

<?xml version="1.0" encoding="UTF-8"?>
<definitions id="Definition"
  targetNamespace="http://www.jboss.org/drools"
  typeLanguage="http://www.java.com/javaTypes"
  expressionLanguage="http://www.mvel.org/2.0"
  xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"
  xmlns:g="http://www.jboss.org/drools/flow/gpd"
  xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
  xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
  xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
  xmlns:tns="http://www.jboss.org/drools">
   <itemDefinition id="_sItem" structureRef="String" />
   <itemDefinition id="_jbpm-unique-3_InMessageType" structureRef="java.lang.String" />
   <message id="_jbpm-unique-3_InMessage" itemRef="_jbpm-unique-3_InMessageType" />
  <interface id="_jbpm-unique-3_ServiceInterface" name="com.sample.BriefVerify"  implementationRef="" >
   <operation id="_jbpm-unique-3_ServiceOperation" name="sayHello" implementationRef="" >
   <inMessageRef>_jbpm-unique-3_InMessage</inMessageRef>
   </operation>
  </interface>
  <process processType="Private" isExecutable="true" id="com.sample.bpmn.ServiceProcess" name="Service Process" >
   <!-- process variables -->
   <property id="s" itemSubjectRef="_sItem"/>
   <!-- nodes -->
  <startEvent id="_jbpm-unique-2" name="Start"  isInterrupting="false"/>
  <serviceTask id="_jbpm-unique-3" name="Hello" operationRef="_jbpm-unique-3_ServiceOperation" implementation="Other" >
  <ioSpecification>
   <dataInput id="_jbpm-unique-3_param" name="Parameter" />
   <dataOutput id="_jbpm-unique-3_result" name="Result" />
   <inputSet>
   <dataInputRefs>_jbpm-unique-3_param</dataInputRefs>
   </inputSet>
   <outputSet>
   <dataOutputRefs>_jbpm-unique-3_result</dataOutputRefs>
   </outputSet>
  </ioSpecification>
</serviceTask>
<endEvent id="_jbpm-unique-4" name="End" >
   <terminateEventDefinition />
</endEvent>
<!-- connections -->
<sequenceFlow id="_jbpm-unique-2-_jbpm-unique-3" sourceRef="_jbpm-unique-2" targetRef="_jbpm-unique-3" />
  <sequenceFlow id="_jbpm-unique-3-_jbpm-unique-4" sourceRef="_jbpm-unique-3" targetRef="_jbpm-unique-4" />
</process>
<bpmndi:BPMNDiagram>
<bpmndi:BPMNPlane bpmnElement="com.sample.bpmn.ServiceProcess" >
  <bpmndi:BPMNShape bpmnElement="_jbpm-unique-2" >
   <dc:Bounds x="0" y="0" width="48" height="48" />
  </bpmndi:BPMNShape>
  <bpmndi:BPMNShape bpmnElement="_jbpm-unique-3" >
   <dc:Bounds x="197" y="3" width="100" height="48" />
  </bpmndi:BPMNShape>
  <bpmndi:BPMNShape bpmnElement="_jbpm-unique-4" >
   <dc:Bounds x="0" y="0" width="48" height="48" />
  </bpmndi:BPMNShape>
  <bpmndi:BPMNEdge bpmnElement="_jbpm-unique-2-_jbpm-unique-3" >
   <di:waypoint x="24" y="24" />
   <di:waypoint x="247" y="27" />
  </bpmndi:BPMNEdge>
  <bpmndi:BPMNEdge bpmnElement="_jbpm-unique-3-_jbpm-unique-4" >
   <di:waypoint x="247" y="27" />
   <di:waypoint x="24" y="24" />
  </bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>

The rest of the files are here: https://github.com/tujasiri/BriefReqVerify

Any help is appreciated!

-TU

[salaboy21]

Can you explain what is the issue that you are getting?

Regards

[lauradp]

Hi,

If you are running this workItemHandler https://github.com/tujasiri/BriefReqVerify/blob/master/src/main/java/com/sample/MyWorkItemHandler.java

I cannot see any custom method invocation.

public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {

        System.out.println("GOOD BYE WORLD");

        manager.completeWorkItem(workItem.getId(), null);

    }

Please can you verify your code on github is correct or provide any trace?

HTH

Laura

[tujasiri]

Yes, that is the code.  I don't have a stack trace.

I thought the actual invocation happened in the BPMN file.

Here:

  <interface id="_jbpm-unique-3_ServiceInterface" name="com.sample.BriefVerify" implementationRef="" >

    <operation id="_jbpm-unique-3_ServiceOperation" name="sayHello" implementationRef="" >

      <inMessageRef>_jbpm-unique-3_InMessage</inMessageRef>

    </operation>

  </interface>

  and then in the <serviceTask> element:

    <serviceTask id="_jbpm-unique-3" name="Hello" operationRef="_jbpm-unique-3_ServiceOperation" implementation="Other" >

      <ioSpecification>

        <dataInput id="_jbpm-unique-3_param" name="Parameter" />

        <dataOutput id="_jbpm-unique-3_result" name="Result" />

        <inputSet>

          <dataInputRefs>_jbpm-unique-3_param</dataInputRefs>

        </inputSet>

        <outputSet>

          <dataOutputRefs>_jbpm-unique-3_result</dataOutputRefs>

        </outputSet>

      </ioSpecification>

    </serviceTask>

Should I be doing some work in the executeWorkItem() method?

I was able to dump the workitem object the Interface and Operation properties corresponding with the <interface> and <operation> elements are set.  I don't know what's supposed to make the method call.

[tujasiri]

Thank you very much lauradp.  My task is launching now and I'm proceeding.  I don't now how I missed the actually invocation of the method having to be in "executeWorkItem()"!