[jboss-user] [jBPM] - Facing an error while using service task for web service

[snowstorm tech]

snowstorm tech [https://community.jboss.org/people/snowstormuser] created the discussion

"Facing an error while using service task for web service"

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Hi,

I am facing an error while execuation of the example from this link.

https://github.com/mswiderski/jbpm-examples/blob/master/jbpm-ws-sample/ https://github.com/mswiderski/jbpm-examples/blob/master/jbpm-ws-sample/

here i'm provding the *bpmn file*, *java code* and *error*

The web service that i used is:-*
*

http://schemas.xmlsoap.org/wsdl/" location="http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL" namespace="http://ws.cdyne.com/WeatherWS/

And i also used the class which are genrated for the webservice above specified in my project class path.

*bpmn file:-*
*
*

<?xml version="1.0" encoding="UTF-8"?>
<definitions id="Definition"
             targetNamespace=" http://www.example.org/MinimalExample http://www.example.org/MinimalExample"
             typeLanguage=" http://www.java.com/javaTypes http://www.java.com/javaTypes"
             expressionLanguage=" http://www.mvel.org/2.0 http://www.mvel.org/2.0"
             xmlns=" http://www.omg.org/spec/BPMN/20100524/MODEL http://www.omg.org/spec/BPMN/20100524/MODEL"
             xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation=" http://www.omg.org/spec/BPMN/20100524/MODEL http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"
             xmlns:g=" http://www.jboss.org/drools/flow/gpd http://www.jboss.org/drools/flow/gpd"
             xmlns:bpmndi=" http://www.omg.org/spec/BPMN/20100524/DI http://www.omg.org/spec/BPMN/20100524/DI"
             xmlns:dc=" http://www.omg.org/spec/DD/20100524/DC http://www.omg.org/spec/DD/20100524/DC"
             xmlns:di=" http://www.omg.org/spec/DD/20100524/DI http://www.omg.org/spec/DD/20100524/DI"
             xmlns:tns=" http://www.jboss.org/drools http://www.jboss.org/drools">
  <import importType=" http://schemas.xmlsoap.org/wsdl/ http://schemas.xmlsoap.org/wsdl/" location=" http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL http://wsf.cdyne.com/WeatherWS/Weather.asmx?WSDL" namespace=" http://ws.cdyne.com/WeatherWS/ http://ws.cdyne.com/WeatherWS/"/>
  <itemDefinition id="_sItem"/>
  <itemDefinition id="_listItem" structureRef="java.util.Collection"/>
  <itemDefinition id="_listItemOut" structureRef="java.util.Collection"/>
  <itemDefinition id="_map" structureRef="java.util.Map"/>
  <itemDefinition id="_2-2-4-itemItem" />
  <itemDefinition id="_5-listItem" />
  <itemDefinition id="_2_multiInstanceItemType" />
  <itemDefinition id="_2_multiInstanceItemOutType"/>
  <itemDefinition id="_2-2-4_InMessageType" />
  <message id="_2-2-4_InMessage" itemRef="_2-2-4_InMessageType" />
  <interface id="_2-2-4_ServiceInterface" name="" implementationRef="WeatherSoap">
    <operation id="_2-2-4_ServiceOperation" implementationRef="GetCityWeatherByZIP" name="">
      <inMessageRef>_2-2-4_InMessage</inMessageRef>
    </operation>
  </interface>
  <process processType="Private" isExecutable="true" id="WeatherWSServiceProcess" name="WeatherWSServiceProcess" tns:packageName="defaultPackage">
    <!-- process variables -->
    <property id="list" itemSubjectRef="_listItem"/>
    <property id="listOut" itemSubjectRef="_listItemOut"/>
    <property id="mode" itemSubjectRef="_sItem"/>
    <property id="map" itemSubjectRef="_map"/>
    <!-- nodes -->
    <startEvent id="_1" name="StartProcess" >
    </startEvent>
     <scriptTask id="_21" name="Prepare input" scriptFormat=" http://www.java.com/java http://www.java.com/java" >
      <script>
      System.out.println("Get zip code result is " + map);
      list =  new java.util.ArrayList(map.values());
      list.remove("Complete");
      listOut =  new java.util.ArrayList();
      kcontext.setVariable("list", list);
      kcontext.setVariable("listOut", listOut);
     </script>
    </scriptTask>
    <serviceTask id="_2" name="Get weather forecast" operationRef="_2-2-4_ServiceOperation" implementation="##WebService" >
    <extensionElements>
        <tns:onEntry-script scriptFormat=" http://www.java.com/java http://www.java.com/java">
          <script>System.out.println("WS1");</script>
        </tns:onEntry-script>
        <tns:onExit-script>
          <script>System.out.println("WS2");</script>
        </tns:onExit-script>
      </extensionElements>
      <ioSpecification>
        <dataInput id="_2-2-4_param" name="Parameter" />
        <dataInput id="DataInput_1" name="mode"/>
        <dataInput id="_2_listInput" name="list"/>
        <dataOutput id="_2_listOutOutput" name="listOut"/>
        <dataOutput id="_2-2-4_result" name="Result" />
        <inputSet>
          <dataInputRefs>_2-2-4_param</dataInputRefs>
          <dataInputRefs>DataInput_1</dataInputRefs>
        </inputSet>
        <outputSet>
          <dataOutputRefs>_2_listOutOutput</dataOutputRefs>
        </outputSet>
      </ioSpecification>
       <dataInputAssociation>
        <targetRef>_2-2-4_param</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">#{item}</from>
          <to xsi:type="tFormalExpression">_2-2-4_param</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <sourceRef>mode</sourceRef>
        <targetRef>DataInput_1</targetRef>
      </dataInputAssociation>
      <dataInputAssociation id="DataInputAssociation_1">
        <sourceRef>list</sourceRef>
        <targetRef>_2_listInput</targetRef>
      </dataInputAssociation>
      <dataOutputAssociation>
        <sourceRef>_2-2-4_result</sourceRef>
        <targetRef>itemOut</targetRef>
      </dataOutputAssociation>
      <multiInstanceLoopCharacteristics>
        <loopDataInputRef>_2_input</loopDataInputRef>
        <loopDataOutputRef>_2_listOutOutput</loopDataOutputRef>
        <inputDataItem id="item" itemSubjectRef="_2_multiInstanceItemType"/>
        <outputDataItem id="itemOut" itemSubjectRef="_2_multiInstanceItemOutType"/>
      </multiInstanceLoopCharacteristics>
    </serviceTask>
    <scriptTask id="_3" name="Log result" >
      <script>System.out.println("Service result " + listOut);</script>
    </scriptTask>
    <endEvent id="_4" name="EndProcess" >
        <terminateEventDefinition/>
    </endEvent>
    <userTask id="_5" name="Get zip codes" >
                    <ioSpecification>
        <dataInput id="_2_CommentInput" name="Comment" />
        <dataInput id="_2_SkippableInput" name="Skippable" />
        <dataInput id="_2_TaskNameInput" name="TaskName" />
        <dataInput id="_2_GroupIdInput" name="GroupId" />
        <dataInput id="_2_PriorityInput" name="Priority" />
        <dataOutput id="_2_ResultOutput" name="Result" />
        <inputSet>
          <dataInputRefs>_2_CommentInput</dataInputRefs>
          <dataInputRefs>_2_SkippableInput</dataInputRefs>
          <dataInputRefs>_2_TaskNameInput</dataInputRefs>
          <dataInputRefs>_2_GroupIdInput</dataInputRefs>
          <dataInputRefs>_2_PriorityInput</dataInputRefs>
        </inputSet>
        <outputSet>
          <dataOutputRefs>_2_ResultOutput</dataOutputRefs>
        </outputSet>
      </ioSpecification>
      <dataInputAssociation>
        <targetRef>_2_CommentInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_2_CommentInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_2_SkippableInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">false</from>
          <to xsi:type="tFormalExpression">_2_SkippableInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_2_TaskNameInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">firstTask</from>
          <to xsi:type="tFormalExpression">_2_TaskNameInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_2_GroupIdInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_2_GroupIdInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_2_PriorityInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_2_PriorityInput</to>
        </assignment>
      </dataInputAssociation>
      <dataOutputAssociation>
        <sourceRef>_2_ResultOutput</sourceRef>
        <targetRef>map</targetRef>
      </dataOutputAssociation>
      <potentialOwner>
        <resourceAssignmentExpression>
          <formalExpression>john</formalExpression>
        </resourceAssignmentExpression>
      </potentialOwner>
    </userTask>
    <userTask id="_6" name="Show forecast" >
      <ioSpecification>
        <dataInput id="_4_outputInput" name="output" />
        <dataInput id="_4_CommentInput" name="Comment" />
        <dataInput id="_4_SkippableInput" name="Skippable" />
        <dataInput id="_4_TaskNameInput" name="TaskName" />
        <dataInput id="_4_GroupIdInput" name="GroupId" />
        <dataInput id="_4_PriorityInput" name="Priority" />
        <inputSet>
          <dataInputRefs>_4_outputInput</dataInputRefs>
          <dataInputRefs>_4_CommentInput</dataInputRefs>
          <dataInputRefs>_4_SkippableInput</dataInputRefs>
          <dataInputRefs>_4_TaskNameInput</dataInputRefs>
          <dataInputRefs>_4_GroupIdInput</dataInputRefs>
          <dataInputRefs>_4_PriorityInput</dataInputRefs>
        </inputSet>
        <outputSet>
        </outputSet>
      </ioSpecification>
      <dataInputAssociation>
        <sourceRef>listOut</sourceRef>
        <targetRef>_4_outputInput</targetRef>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_4_CommentInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_4_CommentInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_4_SkippableInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">false</from>
          <to xsi:type="tFormalExpression">_4_SkippableInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_4_TaskNameInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression">secondTask</from>
          <to xsi:type="tFormalExpression">_4_TaskNameInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_4_GroupIdInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_4_GroupIdInput</to>
        </assignment>
      </dataInputAssociation>
      <dataInputAssociation>
        <targetRef>_4_PriorityInput</targetRef>
        <assignment>
          <from xsi:type="tFormalExpression"></from>
          <to xsi:type="tFormalExpression">_4_PriorityInput</to>
        </assignment>
      </dataInputAssociation>
      <potentialOwner>
        <resourceAssignmentExpression>
          <formalExpression>john</formalExpression>
        </resourceAssignmentExpression>
      </potentialOwner>
    </userTask>
    <!-- connections -->
    <sequenceFlow id="_21-_2" sourceRef="_21" targetRef="_2" />
    <sequenceFlow id="_2-_3" sourceRef="_2" targetRef="_3" />
    <sequenceFlow id="_3-_6" sourceRef="_3" targetRef="_6" />
    <sequenceFlow id="_1-_5" sourceRef="_1" targetRef="_5" />
    <sequenceFlow id="_5-_21" sourceRef="_5" targetRef="_21" />
    <sequenceFlow id="_6-_4" sourceRef="_6" targetRef="_4" />
  </process>
  <bpmndi:BPMNDiagram>
    <bpmndi:BPMNPlane bpmnElement="WeatherWSServiceProcess" >
      <bpmndi:BPMNShape bpmnElement="_1" >
        <dc:Bounds x="16" y="67" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_2" >
        <dc:Bounds x="228" y="16" width="200" height="150" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_21" >
        <dc:Bounds x="128" y="26" width="200" height="150" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_3" >
        <dc:Bounds x="460" y="67" width="92" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_4" >
        <dc:Bounds x="584" y="67" width="48" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_5" >
        <dc:Bounds x="96" y="67" width="100" height="48" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="_6" >
        <dc:Bounds x="96" y="67" width="140" height="148" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="_21-_2" >
        <di:waypoint x="140" y="50" />
        <di:waypoint x="144" y="117" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_2-_3" >
        <di:waypoint x="42" y="49" />
        <di:waypoint x="140" y="50" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_3-_6" >
        <di:waypoint x="146" y="91" />
        <di:waypoint x="328" y="91" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_1-_5" >
        <di:waypoint x="328" y="91" />
        <di:waypoint x="506" y="91" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_5-_21" >
        <di:waypoint x="506" y="91" />
        <di:waypoint x="608" y="91" />
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="_6-_4" >
        <di:waypoint x="40" y="91" />
        <di:waypoint x="146" y="91" />
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

*Java code:-*
*
*

import java.util.*;
import javax.xml.ws.Endpoint;
import org.drools.KnowledgeBase;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.definition.process.Connection;
import org.drools.definition.process.Node;
import org.drools.io.ResourceFactory;
import org.drools.runtime.StatefulKnowledgeSession;
import org.drools.runtime.process.NodeInstance;
import org.drools.runtime.process.WorkItem;
import org.drools.runtime.process.WorkItemHandler;
import org.drools.runtime.process.WorkItemManager;
import org.jbpm.bpmn2.handler.ServiceTaskHandler;
import org.jbpm.process.instance.ProcessInstance;
import org.jbpm.process.workitem.wsht.CommandBasedWSHumanTaskHandler;
import org.jbpm.task.service.TaskClientHandler;
import org.jbpm.workflow.core.node.HumanTaskNode;
import org.jbpm.workflow.instance.WorkflowProcessInstance;
import org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl;
public class ProcessMain {
          public static void main(String[] args) throws Exception {
                        KnowledgeBase kbase = readKnowledgeBase();
                        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
            TestWorkItemHandler htHandler = new TestWorkItemHandler();
                  ksession.getWorkItemManager().registerWorkItemHandler("Service Task", new ServiceTaskHandler());
                  ksession.getWorkItemManager().registerWorkItemHandler("Human Task", htHandler);
                  Map<String, Object> params = new HashMap<String, Object>();
                  params.put("mode", "async");
                  WorkflowProcessInstance processInstance = (WorkflowProcessInstance) ksession.startProcess("WeatherWSServiceProcess", params);
                  params = new HashMap<String, Object>();
                  params.put("r1", "14025");
                  HashMap<String, Object> results = new HashMap<String, Object>();
                  results.put("Result", params);
                  ksession.getWorkItemManager().completeWorkItem(htHandler.getWorkItem().getId(), results);
                  Thread.sleep(5000);
                              ksession.getWorkItemManager().completeWorkItem(htHandler.getWorkItem().getId(), null);
          }
           static class TestWorkItemHandler implements WorkItemHandler {
                              private static TestWorkItemHandler INSTANCE = new TestWorkItemHandler();
                              private WorkItem workItem;
                              private WorkItem aborted;
                              public static TestWorkItemHandler getInstance() {
                                        return INSTANCE;
                              }
                              public void executeWorkItem(WorkItem workItem, WorkItemManager manager) {
                                        this.workItem = workItem;
                              }
                              public void abortWorkItem(WorkItem workItem, WorkItemManager manager) {
                                        this.aborted = workItem;
                              }
                              public WorkItem getWorkItem() {
                                        WorkItem result = workItem;
                                        workItem = null;
                                        return result;
                              }
                              public WorkItem getAbortedWorkItem() {
                                        WorkItem result = aborted;
                                        aborted = null;
                                        return result;
                              }
                    }
}

*Error:-*
*
*

Get zip code result is {r1=14025}

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