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Output mapping from Human Task does not work
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created by <a href="https://community.jboss.org/people/jchocholacek">Jozef Chocholáček</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/800540#800540">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello there,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I have a problem with mapping the Human Task output to process variables. My code is inspired by the <a class="jive-link-blog-small" href="https://community.jboss.org/people/bpmn2user/blog/2011/09/21/jbpm5-web-example">https://community.jboss.org/people/bpmn2user/blog/2011/09/21/jbpm5-web-example</a> blog post.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I run it in Tomcat 6, using the Mina HT service.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is my process definition:</p><pre class="jive-pre"><code class="jive-code jive-xml"><span class="jive-xml-tag"><?xml version="1.0" encoding="UTF-8"?></span>
<span class="jive-xml-tag"><span><definitions id="Definition"
             targetNamespace="</span><a class="jive-link-external-small" href="http://www.jboss.org/drools" target="_blank">http://www.jboss.org/drools</a><span>"
             typeLanguage="</span><a class="jive-link-external-small" href="http://www.java.com/javaTypes" rel="nofollow" target="_blank">http://www.java.com/javaTypes</a><span>"
             expressionLanguage="</span><a class="jive-link-external-small" href="http://www.mvel.org/2.0" rel="nofollow" target="_blank">http://www.mvel.org/2.0</a><span>"
             xmlns="</span><a class="jive-link-external-small" href="http://www.omg.org/spec/BPMN/20100524/MODEL" rel="nofollow" target="_blank">http://www.omg.org/spec/BPMN/20100524/MODEL</a><span>"
             xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" rel="nofollow" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"
             xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://www.omg.org/spec/BPMN/20100524/MODEL" rel="nofollow" target="_blank">http://www.omg.org/spec/BPMN/20100524/MODEL</a><span> BPMN20.xsd"
             xmlns:g="</span><a class="jive-link-external-small" href="http://www.jboss.org/drools/flow/gpd" target="_blank">http://www.jboss.org/drools/flow/gpd</a><span>"
             xmlns:bpmndi="</span><a class="jive-link-external-small" href="http://www.omg.org/spec/BPMN/20100524/DI" rel="nofollow" target="_blank">http://www.omg.org/spec/BPMN/20100524/DI</a><span>"
             xmlns:dc="</span><a class="jive-link-external-small" href="http://www.omg.org/spec/DD/20100524/DC" rel="nofollow" target="_blank">http://www.omg.org/spec/DD/20100524/DC</a><span>"
             xmlns:di="</span><a class="jive-link-external-small" href="http://www.omg.org/spec/DD/20100524/DI" rel="nofollow" target="_blank">http://www.omg.org/spec/DD/20100524/DI</a><span>"
             xmlns:tns="</span><a class="jive-link-external-small" href="http://www.jboss.org/drools" target="_blank">http://www.jboss.org/drools</a><span>"></span></span>
  <span class="jive-xml-tag"><itemDefinition id="_mgnlDataItem" structureRef="java.util.Map" /></span>
  <span class="jive-xml-tag"><itemDefinition id="_9-mgnlDataItem" structureRef="java.util.Map" /></span>
  <span class="jive-xml-tag"><process processType="Private" isExecutable="true" id="jch.workflow.test" name="Flow Test" tns:packageName="defaultPackage" ></span>
    <span class="jive-xml-tag"><extensionElements></span>
     <span class="jive-xml-tag"><tns:import name="java.util.Map" /></span>
    <span class="jive-xml-tag"></extensionElements></span>
    <span class="jive-xml-comment"><!-- process variables -->
    <span class="jive-xml-tag"><property id="mgnlData" itemSubjectRef="_mgnlDataItem"/></span>
    <!-- nodes -->
    <span class="jive-xml-tag"><startEvent id="_1" name="StartProcess" /></span>
    <span class="jive-xml-tag"><endEvent id="_6" name="End" ></span>
        <span class="jive-xml-tag"><terminateEventDefinition/></span>
    <span class="jive-xml-tag"></endEvent></span>
    <span class="jive-xml-tag"><span><scriptTask id="_7" name="Entry Script" scriptFormat="</span><a class="jive-link-external-small" href="http://www.java.com/java" rel="nofollow" target="_blank">http://www.java.com/java</a><span>" ></span></span>
      <span class="jive-xml-tag"><script></span>String processId = "" + kcontext.getProcessInstance().getId();
System.out.println("ENTRY SCRIPT: " + processId);
Map data = (Map) kcontext.getVariable("mgnlData");
if (data==null) {
  System.out.println("Empty DATA");
} else {
  System.out.println("DATA: " + data.toString());
}
<span class="jive-xml-tag"></script></span>
    <span class="jive-xml-tag"></scriptTask></span>
    <span class="jive-xml-tag"><span><scriptTask id="_8" name="Exit Script" scriptFormat="</span><a class="jive-link-external-small" href="http://www.java.com/java" rel="nofollow" target="_blank">http://www.java.com/java</a><span>" ></span></span>
      <span class="jive-xml-tag"><script></span>String processId = "" + kcontext.getProcessInstance().getId();
System.out.println("EXIT SCRIPT: " + processId);
Map data = (Map) kcontext.getVariable("mgnlData");
if (data==null) {
  System.out.println("Empty DATA");
} else {
  System.out.println("DATA: " + data.toString());
}
<span class="jive-xml-tag"></script></span>
    <span class="jive-xml-tag"></scriptTask></span>
    <span class="jive-xml-tag"><userTask id="_9" name="User Task" ></span>
      <span class="jive-xml-tag"><extensionElements></span>
        <span class="jive-xml-tag"><span><tns:onEntry-script scriptFormat="</span><a class="jive-link-external-small" href="http://www.java.com/java" rel="nofollow" target="_blank">http://www.java.com/java</a><span>"></span></span>
          <span class="jive-xml-tag"><script></span>System.out.println("Human Task - Entry action");<span class="jive-xml-tag"></script></span>
        <span class="jive-xml-tag"></tns:onEntry-script></span>
        <span class="jive-xml-tag"><span><tns:onExit-script scriptFormat="</span><a class="jive-link-external-small" href="http://www.java.com/java" rel="nofollow" target="_blank">http://www.java.com/java</a><span>"></span></span>
          <span class="jive-xml-tag"><script></span>System.out.println("Human Task - Exit action");<span class="jive-xml-tag"></script></span>
        <span class="jive-xml-tag"></tns:onExit-script></span>
      <span class="jive-xml-tag"></extensionElements></span>
      <span class="jive-xml-tag"><ioSpecification></span>
        <span class="jive-xml-tag"><dataInput id="_9_ContentInput" name="Content" /></span>
        <span class="jive-xml-tag"><dataOutput id="_9_mgnlDataOutput" name="mgnlData" /></span>
        <span class="jive-xml-tag"><inputSet></span>
          <span class="jive-xml-tag"><dataInputRefs></span>_9_ContentInput<span class="jive-xml-tag"></dataInputRefs></span>
        <span class="jive-xml-tag"></inputSet></span>
        <span class="jive-xml-tag"><outputSet></span>
          <span class="jive-xml-tag"><dataOutputRefs></span>_9_mgnlDataOutput<span class="jive-xml-tag"></dataOutputRefs></span>
        <span class="jive-xml-tag"></outputSet></span>
      <span class="jive-xml-tag"></ioSpecification></span>
      <span class="jive-xml-tag"><dataInputAssociation></span>
        <span class="jive-xml-tag"><sourceRef></span>mgnlData<span class="jive-xml-tag"></sourceRef></span>
        <span class="jive-xml-tag"><targetRef></span>_9_ContentInput<span class="jive-xml-tag"></targetRef></span>
      <span class="jive-xml-tag"></dataInputAssociation></span>
      <span class="jive-xml-tag"><dataOutputAssociation></span>
        <span class="jive-xml-tag"><sourceRef></span>_9_mgnlDataOutput<span class="jive-xml-tag"></sourceRef></span>
        <span class="jive-xml-tag"><targetRef></span>mgnlData<span class="jive-xml-tag"></targetRef></span>
      <span class="jive-xml-tag"></dataOutputAssociation></span>
      <span class="jive-xml-tag"><potentialOwner></span>
        <span class="jive-xml-tag"><resourceAssignmentExpression></span>
          <span class="jive-xml-tag"><formalExpression></span>peter<span class="jive-xml-tag"></formalExpression></span>
        <span class="jive-xml-tag"></resourceAssignmentExpression></span>
      <span class="jive-xml-tag"></potentialOwner></span>
    <span class="jive-xml-tag"></userTask></span>
    <!-- connections --></span>
    <span class="jive-xml-tag"><sequenceFlow id="_8-_6" sourceRef="_8" targetRef="_6" /></span>
    <span class="jive-xml-tag"><sequenceFlow id="_1-_7" sourceRef="_1" targetRef="_7" /></span>
    <span class="jive-xml-tag"><sequenceFlow id="_9-_8" sourceRef="_9" targetRef="_8" /></span>
    <span class="jive-xml-tag"><sequenceFlow id="_7-_9" sourceRef="_7" targetRef="_9" /></span>
  <span class="jive-xml-tag"></process></span>
  <span class="jive-xml-tag"><bpmndi:BPMNDiagram></span>
    ...
  <span class="jive-xml-tag"></bpmndi:BPMNDiagram></span>
<span class="jive-xml-tag"></definitions></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is how I start the process:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    <font color="navy"><b>public</b></font> RunningProcess launch(Workflow workflow, Map<String, Object> parameters) <font color="navy"><b>throws</b></font> WorkflowException <font color="navy">{</font>
        Map<String,Object> processParams = <font color="navy"><b>new</b></font> HashMap<String,Object>();
        processParams.put(RunningProcess.DATA, parameters);
        <font color="navy"><b>try</b></font> <font color="navy">{</font>
            <font color="darkgreen">// start user transaction</font>
            UserTransaction ut = (UserTransaction) <font color="navy"><b>new</b></font> InitialContext().lookup(<font color="red">"java:comp/UserTransaction"</font>);
            ut.begin();
            <font color="darkgreen">// start process</font>
            ProcessInstance pi = this.ksession.startProcess(workflow.getId(), processParams);
            this.ksession.fireAllRules();
            <font color="darkgreen">// commit</font>
            ut.commit();
            <font color="navy"><b>return</b></font> <font color="navy"><b>new</b></font> ProcessImpl(pi);
        <font color="navy">}</font> <font color="navy"><b>catch</b></font> (Exception e) <font color="navy">{</font>
            log.debug(<font color="red">"Error starting workflow ["</font> + workflow.getId() + <font color="red">"]."</font>, e);
            <font color="navy"><b>throw</b></font> <font color="navy"><b>new</b></font> WorkflowException(<font color="red">"Error starting workflow."</font>, e);
        <font color="navy">}</font>
    <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><span style="font-family: 'andale mono', times;">RunningProcess.DATA</span> containg the "<span style="font-family: 'andale mono', times;">mgnlData</span>" string, <span style="font-family: 'andale mono', times;">Workflow</span> is my bean holding the process definition data, <span style="font-family: 'andale mono', times;">RunningProcess</span> / <span style="font-family: 'andale mono', times;">ProcessImpl</span> are my wrappers for the <span style="font-family: 'andale mono', times;">ProcessInstace</span>. Then I call this method from:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">Map<String, Object> data = <font color="navy"><b>new</b></font> HashMap<String, Object>();
data.put(<font color="red">"string"</font>, <font color="red">"string value"</font>);
data.put(<font color="red">"int"</font>, 42);
process = manager.launch(<font color="red">"test"</font>, data);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And how I handle the Human Task:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java"><font color="darkgreen">// prepare data</font>
Map<String, Object> data = <font color="navy"><b>new</b></font> HashMap<String, Object>();
Map<String, Object> mgnlData = <font color="navy"><b>new</b></font> HashMap<String, Object>();
mgnlData.put(<font color="red">"int"</font>, 1111);
mgnlData.put(<font color="red">"string"</font>, <font color="red">"new value"</font>);
data.put(RunningProcess.DATA, mgnlData);
<font color="darkgreen">// start user transaction</font>
UserTransaction ut = (UserTransaction) <font color="navy"><b>new</b></font> InitialContext().lookup(<font color="red">"java:comp/UserTransaction"</font>);
ut.begin();
<font color="darkgreen">// start processing the task</font>
BlockingTaskOperationResponseHandler responseHandler = <font color="navy"><b>new</b></font> BlockingTaskOperationResponseHandler();
this.taskClient.start(summary.getId(), user, responseHandler);
responseHandler.waitTillDone(1000);
<font color="darkgreen">// and complete the task</font>
responseHandler = <font color="navy"><b>new</b></font> BlockingTaskOperationResponseHandler();
this.taskClient.complete(summary.getId(), user, map2contentData(data), responseHandler);
responseHandler.waitTillDone(2000);
<font color="darkgreen">// commit transaction</font>
ut.commit();
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The map2contentData method is based on the code from jBPM5 web example blog post:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    <font color="navy"><b>protected</b></font> ContentData map2contentData(Map data) <font color="navy">{</font>
        ContentData contentData = <font color="navy"><b>null</b></font>;
        <font color="navy"><b>if</b></font> (data != <font color="navy"><b>null</b></font>) <font color="navy">{</font>
            ByteArrayOutputStream bos = <font color="navy"><b>new</b></font> ByteArrayOutputStream();
            ObjectOutputStream out;
            <font color="navy"><b>try</b></font> <font color="navy">{</font>
                out = <font color="navy"><b>new</b></font> ObjectOutputStream(bos);
                out.writeObject(data);
                out.close();
                contentData = <font color="navy"><b>new</b></font> ContentData();
                contentData.setContent(bos.toByteArray());
                contentData.setAccessType(AccessType.Inline);
            <font color="navy">}</font> <font color="navy"><b>catch</b></font> (IOException e) <font color="navy">{</font>
                log.error(<font color="red">"Problem saving output data."</font>, e);
            <font color="navy">}</font>
        <font color="navy">}</font>
        <font color="navy"><b>return</b></font> contentData;
    <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>But it results in the empty process variable in the end (console output):</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code">ENTRY SCRIPT: 425984
DATA: {int=42, string=string value}
Human Task - Entry action
...
Human Task - Exit action
EXIT SCRIPT: 425984
Empty DATA
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I expect sort-of PEBKAC error, but I couldn't find what did I forget...</p></div>
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