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NPE while serviceTask call
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created by <a href="http://community.jboss.org/people/clauss">Claus Straube</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/534977#534977">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi all,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm always running in a NPE with BPMN 2.0 (jBPM 4.3) and Spring 2.5.3.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is my testcase:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">    @Test
    <font color="navy"><b>public</b></font> <font color="navy"><b>void</b></font> testAsyncCalls()<font color="navy">{</font>
        <font color="darkgreen">//deploy process</font>
        repositoryService.createDeployment().addResourceFromClasspath(<font color="red">"async_service_call.bpmn.xml"</font>).deploy();
       
        <font color="darkgreen">//start instance</font>
        ProcessInstance instance = executionService.startProcessInstanceByKey(<font color="red">"foobar"</font>);
        Assert.assertNotNull(instance);
       
        <font color="darkgreen">//get instance id</font>
        String iid = instance.getId();
       
        <font color="darkgreen">//set instance id as variable</font>
        executionService.setVariable(iid, <font color="red">"instanceId"</font>, iid);
       
        <font color="darkgreen">//signal first execution</font>
        Execution e1 = instance.findActiveExecutionIn(<font color="red">"r1"</font>);
        Assert.assertNotNull(e1);
        executionService.signalExecutionById(e1.getId());
       
        <font color="darkgreen">//get instance back</font>
        ProcessInstance instance2 = executionService.findProcessInstanceById(iid);
        Assert.assertNotNull(instance2);
       
        <font color="darkgreen">//check if the var has been set</font>
        Assert.assertEquals(<font color="red">"foo"</font>, executionService.getVariable(iid, <font color="red">"v1"</font>));
       
        <font color="darkgreen">//signal second execution</font>
        Execution e2 = instance2.findActiveExecutionIn(<font color="red">"r2"</font>);
        Assert.assertNotNull(e2);
        ProcessInstance instance3 = executionService.signalExecutionById(e2.getId());
       
        <font color="darkgreen">//check if the instance has been ended</font>
        Assert.assertTrue(instance3.isEnded());
    <font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is the process:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </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><bpmn:definitions id="ServiceTaskJava"
    xmlns:xsi="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema-instance" target="_blank">http://www.w3.org/2001/XMLSchema-instance</a><span>"
    xsi:schemaLocation="</span><a class="jive-link-external-small" href="http://schema.omg.org/spec/BPMN/2.0" target="_blank">http://schema.omg.org/spec/BPMN/2.0</a><span> BPMN20.xsd"
    xmlns:bpmn="</span><a class="jive-link-external-small" href="http://schema.omg.org/spec/BPMN/2.0" target="_blank">http://schema.omg.org/spec/BPMN/2.0</a><span>" typeLanguage="</span><a class="jive-link-external-small" href="http://www.w3.org/2001/XMLSchema" target="_blank">http://www.w3.org/2001/XMLSchema</a><span>"
    expressionLanguage="</span><a class="jive-link-external-small" href="http://www.w3.org/1999/XPath" target="_blank">http://www.w3.org/1999/XPath</a><span>" targetNamespace="</span><a class="jive-link-external-small" href="http://sample.bpmn.camunda.com/" target="_blank">http://sample.bpmn.camunda.com/</a><span>"
    xmlns:jbpm="</span><a class="jive-link-external-small" href="http://jbpm.org/4.0/bpmn2" target="_blank">http://jbpm.org/4.0/bpmn2</a><span>"></span></span>
    <span class="jive-xml-tag"><bpmn:itemDefinition id="i1"></span>
        <span class="jive-xml-tag"><jbpm:arg></span>
            <span class="jive-xml-tag"><jbpm:object expr="#{instanceId}" /></span>
        <span class="jive-xml-tag"></jbpm:arg></span>
    <span class="jive-xml-tag"></bpmn:itemDefinition></span>
    <span class="jive-xml-tag"><bpmn:itemDefinition id="i2"></span>
        <span class="jive-xml-tag"><jbpm:var name="v1" /></span>
    <span class="jive-xml-tag"></bpmn:itemDefinition></span>
    <span class="jive-xml-tag"><bpmn:message id="im" name="input message"
        structureRef="i1"></span><span class="jive-xml-tag"></bpmn:message></span>
    <span class="jive-xml-tag"><bpmn:message id="om" name="output message"
        structureRef="i2"></span>
    <span class="jive-xml-tag"></bpmn:message></span>
    <span class="jive-xml-tag"><bpmn:interface id="if1" name="mocks.Mock01"></span>
        <span class="jive-xml-tag"><bpmn:operation id="o1" name="call"></span>
            <span class="jive-xml-tag"><bpmn:inMessageRef></span>inputMessage<span class="jive-xml-tag"></bpmn:inMessageRef></span>
            <span class="jive-xml-tag"><bpmn:outMessageRef></span>outputMessage<span class="jive-xml-tag"></bpmn:outMessageRef></span>
        <span class="jive-xml-tag"></bpmn:operation></span>
    <span class="jive-xml-tag"></bpmn:interface></span>
    <span class="jive-xml-comment"><!-- process definition -->
    <span class="jive-xml-tag"><bpmn:process id="foobar" name="async_process"></span>
        <span class="jive-xml-tag"><bpmn:startEvent id="s" /></span>
       
        <span class="jive-xml-tag"><bpmn:sequenceFlow id="f1" name="s_2_r1" sourceRef="s" targetRef="r1" /></span>
        <span class="jive-xml-tag"><bpmn:receiveTask id="r1" name="r1" /></span>
       
        <!-- start -->
        <span class="jive-xml-tag"><bpmn:sequenceFlow id="f2" name="r1_2_t1" sourceRef="r1" targetRef="t1" /></span>
        <span class="jive-xml-tag"><bpmn:serviceTask id="st1" name="st1" implementation="Other" operationRef="o1"/></span>
       
        <span class="jive-xml-tag"><bpmn:sequenceFlow id="f3" name="st1_2_r2" sourceRef="st1" targetRef="r2" /></span>
        <!-- end -->
       
        <!--
        <span class="jive-xml-tag"><bpmn:sequenceFlow id="fx" name="r1_2_r2" sourceRef="r1" targetRef="r2" /></span>
        --></span>
       
        <span class="jive-xml-tag"><bpmn:receiveTask id="r2" name="r2" /></span>
       
        <span class="jive-xml-tag"><bpmn:sequenceFlow id="f4" name="r2_2_e1" sourceRef="r2" targetRef="e1" /></span>
        <span class="jive-xml-tag"><bpmn:endEvent id="e1" name="e1" /></span>           
    <span class="jive-xml-tag"></bpmn:process></span>
<span class="jive-xml-tag"></bpmn:definitions></span>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and this is the service I want to call:</p><pre class="jive-pre"><code class="jive-code jive-java"><font color="navy"><b>package</b></font> mocks;
 
<font color="navy"><b>public</b></font> <font color="navy"><b>class</b></font> Mock01 <font color="navy">{</font>
       
    <font color="navy"><b>public</b></font> String call(String var)<font color="navy">{</font>
        System.out.println(var);
        <font color="navy"><b>return</b></font> <font color="red">"foo"</font>;
    <font color="navy">}</font>
 
<font color="navy">}</font>
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If I comment out the lines between 'start' and 'end' in my process (and comment in the flow between r1 and r2) no NPE happens (of cource the test fails). But if I run the process as it is, I will get a npe. Can onyone give me a hint where the problem is?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks in advance - Claus</p></div>
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<p style="margin: 0;">Reply to this message by <a href="http://community.jboss.org/message/534977#534977">going to Community</a></p>
<p style="margin: 0;">Start a new discussion in jBPM at <a href="http://community.jboss.org/choose-container!input.jspa?contentType=1&containerType=14&container=2034">Community</a></p>
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