Service Task Error

[biswajit.sarkar]

Hi,

I am using jbpm.6.1.0.Final in our Dev environment.

I am trying to create a simple process where i have added a "Service Task" to call a java method(which I add as a dependency jar of my project).

following is my simple java class which I try to invoke from "Service Task"

package com.test;

public class TestService {

    public String hello(String arg1){

        System.out.println("arguument :"+arg1);

        return arg1;

    }

}

I have created a jar of this class and upload it to the "Artifact Repository". And then add this as a dependency of my project.

But when I try to invoke that method "hello" I am getting "NoSuchMethod Exception"

following is my process code

<?xml version="1.0" encoding="UTF-8"?>

<bpmn2:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.omg.org/bpmn20" xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:bpsim="http://www.bpsim.org/schemas/1.0" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:drools="http://www.jboss.org/drools" id="_hvuukcNiEeSc-sL6266JgQ" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd http://www.jboss.org/drools drools.xsd http://www.bpsim.org/schemas/1.0 bpsim.xsd" expressionLanguage="http://www.mvel.org/2.0" targetNamespace="http://www.omg.org/bpmn20" typeLanguage="http://www.java.com/javaTypes">

  <bpmn2:itemDefinition id="_inputItem" structureRef="String"/>

  <bpmn2:itemDefinition id="_outputItem" structureRef="String"/>

  <bpmn2:itemDefinition id="_19F79C80-D33E-45CC-A82F-F15871139096_InMessageType"/>

  <bpmn2:message id="_19F79C80-D33E-45CC-A82F-F15871139096_InMessage" itemRef="_19F79C80-D33E-45CC-A82F-F15871139096_InMessageType"/>

  <bpmn2:interface id="_19F79C80-D33E-45CC-A82F-F15871139096_ServiceInterface" name="com.test.TestService" implementationRef="com.test.TestService">

    <bpmn2:operation id="_19F79C80-D33E-45CC-A82F-F15871139096_ServiceOperation" name="hello" implementationRef="hello">

      <bpmn2:inMessageRef>_19F79C80-D33E-45CC-A82F-F15871139096_InMessage</bpmn2:inMessageRef>

    </bpmn2:operation>

  </bpmn2:interface>

  <bpmn2:itemDefinition id="__19F79C80-D33E-45CC-A82F-F15871139096_ParameterInputXItem" structureRef="String"/>

  <bpmn2:itemDefinition id="__19F79C80-D33E-45CC-A82F-F15871139096_ResultOutputXItem" structureRef="String"/>

  <bpmn2:process id="Project2.TestProcess2_project2" drools:packageName="org.jbpm" drools:version="1.0" name="TestProcess2_project2" isExecutable="true">

    <bpmn2:property id="input" itemSubjectRef="_inputItem"/>

    <bpmn2:property id="output" itemSubjectRef="_outputItem"/>

    <bpmn2:startEvent id="processStartEvent" drools:bgcolor="#9acd32" drools:selectable="true" name="">

      <bpmn2:outgoing>_1C8728AD-4F67-452C-942B-25668B9FCB41</bpmn2:outgoing>

    </bpmn2:startEvent>

    <bpmn2:serviceTask id="_19F79C80-D33E-45CC-A82F-F15871139096" drools:selectable="true" drools:serviceimplementation="Java" drools:serviceoperation="hello" drools:serviceinterface="com.test.TestService" name="Service Task" implementation="Java" operationRef="_19F79C80-D33E-45CC-A82F-F15871139096_ServiceOperation">

      <bpmn2:incoming>_1C8728AD-4F67-452C-942B-25668B9FCB41</bpmn2:incoming>

      <bpmn2:outgoing>_5FB809EC-0CFE-49A1-848C-107A5D2B0FD1</bpmn2:outgoing>

      <bpmn2:ioSpecification id="_hvyY8MNiEeSc-sL6266JgQ">

        <bpmn2:dataInput id="_19F79C80-D33E-45CC-A82F-F15871139096_ParameterInputX" drools:dtype="String" itemSubjectRef="__19F79C80-D33E-45CC-A82F-F15871139096_ParameterInputXItem" name="Parameter"/>

        <bpmn2:dataOutput id="_19F79C80-D33E-45CC-A82F-F15871139096_ResultOutputX" drools:dtype="String" itemSubjectRef="__19F79C80-D33E-45CC-A82F-F15871139096_ResultOutputXItem" name="Result"/>

        <bpmn2:inputSet id="_hvyY8cNiEeSc-sL6266JgQ">

          <bpmn2:dataInputRefs>_19F79C80-D33E-45CC-A82F-F15871139096_ParameterInputX</bpmn2:dataInputRefs>

        </bpmn2:inputSet>

        <bpmn2:outputSet id="_hvyY8sNiEeSc-sL6266JgQ">

          <bpmn2:dataOutputRefs>_19F79C80-D33E-45CC-A82F-F15871139096_ResultOutputX</bpmn2:dataOutputRefs>

        </bpmn2:outputSet>

      </bpmn2:ioSpecification>

      <bpmn2:dataInputAssociation id="_hvyY88NiEeSc-sL6266JgQ">

        <bpmn2:sourceRef>input</bpmn2:sourceRef>

        <bpmn2:targetRef>_19F79C80-D33E-45CC-A82F-F15871139096_ParameterInputX</bpmn2:targetRef>

      </bpmn2:dataInputAssociation>

      <bpmn2:dataOutputAssociation id="_hvyY9MNiEeSc-sL6266JgQ">

        <bpmn2:sourceRef>_19F79C80-D33E-45CC-A82F-F15871139096_ResultOutputX</bpmn2:sourceRef>

        <bpmn2:targetRef>output</bpmn2:targetRef>

      </bpmn2:dataOutputAssociation>

    </bpmn2:serviceTask>

    <bpmn2:sequenceFlow id="_1C8728AD-4F67-452C-942B-25668B9FCB41" drools:bgcolor="#000000" drools:selectable="true" sourceRef="processStartEvent" targetRef="_19F79C80-D33E-45CC-A82F-F15871139096"/>

    <bpmn2:endEvent id="_24673CA2-5D4F-43EE-A650-AEF3D334038A" drools:bgcolor="#ff6347" drools:selectable="true" name="">

      <bpmn2:incoming>_5FB809EC-0CFE-49A1-848C-107A5D2B0FD1</bpmn2:incoming>

    </bpmn2:endEvent>

    <bpmn2:sequenceFlow id="_5FB809EC-0CFE-49A1-848C-107A5D2B0FD1" drools:bgcolor="#000000" drools:selectable="true" sourceRef="_19F79C80-D33E-45CC-A82F-F15871139096" targetRef="_24673CA2-5D4F-43EE-A650-AEF3D334038A"/>

  </bpmn2:process>

  <bpmndi:BPMNDiagram id="_hvzAAMNiEeSc-sL6266JgQ">

    <bpmndi:BPMNPlane id="_hvzAAcNiEeSc-sL6266JgQ" bpmnElement="Project2.TestProcess2_project2">

      <bpmndi:BPMNShape id="_hvzAAsNiEeSc-sL6266JgQ" bpmnElement="processStartEvent">

        <dc:Bounds height="30.0" width="30.0" x="90.0" y="135.0"/>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape id="_hvzAA8NiEeSc-sL6266JgQ" bpmnElement="_19F79C80-D33E-45CC-A82F-F15871139096">

        <dc:Bounds height="80.0" width="100.0" x="165.0" y="110.0"/>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNEdge id="_hvzABMNiEeSc-sL6266JgQ" bpmnElement="_1C8728AD-4F67-452C-942B-25668B9FCB41">

        <di:waypoint xsi:type="dc:Point" x="105.0" y="150.0"/>

        <di:waypoint xsi:type="dc:Point" x="215.0" y="150.0"/>

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNShape id="_hvzABcNiEeSc-sL6266JgQ" bpmnElement="_24673CA2-5D4F-43EE-A650-AEF3D334038A">

        <dc:Bounds height="28.0" width="28.0" x="309.0" y="135.0"/>

      </bpmndi:BPMNShape>

      <bpmndi:BPMNEdge id="_hvzABsNiEeSc-sL6266JgQ" bpmnElement="_5FB809EC-0CFE-49A1-848C-107A5D2B0FD1">

        <di:waypoint xsi:type="dc:Point" x="215.0" y="150.0"/>

        <di:waypoint xsi:type="dc:Point" x="323.0" y="149.0"/>

      </bpmndi:BPMNEdge>

    </bpmndi:BPMNPlane>

  </bpmndi:BPMNDiagram>

  <bpmn2:relationship id="_hvzAB8NiEeSc-sL6266JgQ" type="BPSimData">

    <bpmn2:extensionElements>

      <bpsim:BPSimData>

        <bpsim:Scenario xsi:type="bpsim:Scenario" id="default" name="Simulationscenario">

          <bpsim:ScenarioParameters xsi:type="bpsim:ScenarioParameters" baseTimeUnit="min"/>

          <bpsim:ElementParameters xsi:type="bpsim:ElementParameters" elementRef="_19F79C80-D33E-45CC-A82F-F15871139096" id="_hvzACMNiEeSc-sL6266JgQ">

            <bpsim:TimeParameters xsi:type="bpsim:TimeParameters">

              <bpsim:ProcessingTime xsi:type="bpsim:Parameter">

                <bpsim:UniformDistribution max="10.0" min="5.0"/>

              </bpsim:ProcessingTime>

            </bpsim:TimeParameters>

            <bpsim:CostParameters xsi:type="bpsim:CostParameters">

              <bpsim:UnitCost xsi:type="bpsim:Parameter">

                <bpsim:FloatingParameter value="0.0"/>

              </bpsim:UnitCost>

            </bpsim:CostParameters>

          </bpsim:ElementParameters>

          <bpsim:ElementParameters xsi:type="bpsim:ElementParameters" elementRef="_5FB809EC-0CFE-49A1-848C-107A5D2B0FD1" id="_hvzACcNiEeSc-sL6266JgQ">

            <bpsim:ControlParameters xsi:type="bpsim:ControlParameters">

              <bpsim:Probability xsi:type="bpsim:Parameter">

                <bpsim:FloatingParameter value="100.0"/>

              </bpsim:Probability>

            </bpsim:ControlParameters>

          </bpsim:ElementParameters>

          <bpsim:ElementParameters xsi:type="bpsim:ElementParameters" elementRef="processStartEvent" id="_hvzACsNiEeSc-sL6266JgQ">

            <bpsim:TimeParameters xsi:type="bpsim:TimeParameters">

              <bpsim:ProcessingTime xsi:type="bpsim:Parameter">

                <bpsim:UniformDistribution max="10.0" min="5.0"/>

              </bpsim:ProcessingTime>

            </bpsim:TimeParameters>

            <bpsim:ControlParameters xsi:type="bpsim:ControlParameters">

              <bpsim:Probability xsi:type="bpsim:Parameter">

                <bpsim:FloatingParameter value="100.0"/>

              </bpsim:Probability>

            </bpsim:ControlParameters>

          </bpsim:ElementParameters>

          <bpsim:ElementParameters xsi:type="bpsim:ElementParameters" elementRef="_24673CA2-5D4F-43EE-A650-AEF3D334038A" id="_hvzAC8NiEeSc-sL6266JgQ">

            <bpsim:TimeParameters xsi:type="bpsim:TimeParameters">

              <bpsim:ProcessingTime xsi:type="bpsim:Parameter">

                <bpsim:UniformDistribution max="10.0" min="5.0"/>

              </bpsim:ProcessingTime>

            </bpsim:TimeParameters>

          </bpsim:ElementParameters>

          <bpsim:ElementParameters xsi:type="bpsim:ElementParameters" elementRef="_1C8728AD-4F67-452C-942B-25668B9FCB41" id="_hvzADMNiEeSc-sL6266JgQ">

            <bpsim:ControlParameters xsi:type="bpsim:ControlParameters">

              <bpsim:Probability xsi:type="bpsim:Parameter">

                <bpsim:FloatingParameter value="100.0"/>

              </bpsim:Probability>

            </bpsim:ControlParameters>

          </bpsim:ElementParameters>

        </bpsim:Scenario>

      </bpsim:BPSimData>

    </bpmn2:extensionElements>

    <bpmn2:source>_hvuukcNiEeSc-sL6266JgQ</bpmn2:source>

    <bpmn2:target>_hvuukcNiEeSc-sL6266JgQ</bpmn2:target>

  </bpmn2:relationship>

</bpmn2:definitions>

My "hello" method accept "String" as an input but while try to invoke that method from jbpm process why jbpm try to pass an java.lang.Object as an input?

how can I add "structureRef=String" for "bpmn2:inMessageRef"?

please correct me if I am doing anything wrong....

[biswajit.sarkar]

Today I tried the same in Jboss BPMS 6.0.3GA.

And getting a wired error while try to start the process

why Jboss BPMS try to find the jar in EAP "modules" directory.

After adding that jar in JBoss EAP "modules" directory now I am getting same error like following

I dont understand what is happening.

Rafael Chies please help me out.

Thanks in advance.       

[krisverlaenen]

First, create a new data input "ParameterType" (by editing the DataInputSet of the service task), and in assignments give this the value java.lang.String, this should override the default Object type with a String type as method param.

Kris

[biswajit.sarkar]

Thanks Kris Verlaenen.

But in Business Central I'm not able to edit the "<bpmn2:message" "itemRef". How can I edit the "itemRef" in "bpmn2:message" after adding the "Service Interface" & "Service Operation" to Service Task??

Also why BPMS try to find  classes(WorkItemHandlers/ Java classes for Service Task) in "modules\system\layers\bpms\org\jbpm\main" location instead of "Business Central/WEB-INF/lib"??

[krisverlaenen]

The web designer currently doesn't allow you to set the "itemRef" element of the bpmn2:message in the XML directly.  The behavior should be identical however if you define a "ParameterType" property on the service task, the ServiceTaskHandler will take that into account.  Please open a JIRA for this and we'll look at improving this (basically storing the ParameterType as itemRef in the message rather than a parameter of the service task).

Regarding modules, depending on which distribution you are using, the web app might be using EAP modules.  As a result, a module is by default only to see the classpath of that module.  Note that in the community we have both a modularized and a non-modularized version of the web-app, so you can select which one you prefer.  You should also be able to define work item handlers as dependencies of the project, or as a global config using deployment descriptors since jBPM 6.1.

[biswajit.sarkar]

Thanks Kris Verlaenen.