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jBPM 5.4 : Signal Event and VariableName
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created by <a href="https://community.jboss.org/people/wishmaster7">wishmaster7</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/795177#795177">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 am a beginner with jBPM and I need some help with the signal event; all I have found in the documentation (and in the web chat) is something like :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">VariableName: The name of the variable that will contain the data associated with this event (if any) when this event occurs.</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And this doesn't help much...</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>So I have created a basic example with a start node, then a AND gateway which waits for the signal event. I'm working with jBPM REST webservices; first I call :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;">POST: <span style="font-family: courier new,courier; font-size: 8pt;"><a class="jive-link-external-small" href="http://localhost:8080/gwt-console-server/rs/process/definition/myProcess/new_instance" rel="nofollow" target="_blank">http://localhost:8080/gwt-console-server/rs/process/definition/myProcess/new_instance</a></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and in the json return, I get the process instance id (in this example: 57). Then I call :</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;">POST: <span style="font-size: 8pt; font-family: courier new,courier;"><a class="jive-link-external-small" href="http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData" rel="nofollow" target="_blank">http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData</a></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and this pefectly triggers the signal event. But I want to pass parameters, and I think the "VariableName" of the signal event is suitable for that. So I have the "woId" variable, but its value is always null.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Here is, in my Java application, the code I use to call the POST webservice:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">private String requestPostService() throws Exception {</span></p><p style="padding-left: 90px;"></p><p style="padding-left: 90px;"><span style="font-family: courier new,courier; font-size: 8pt;">String url = </span><br/><span style="font-size: 8pt; font-family: courier new,courier;"><span>"</span><a class="jive-link-external-small" href="http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData" rel="nofollow" target="_blank">http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData</a><span>";</span></span><br/></p><p style="padding-left: 60px;"><span style="font-family: courier new,courier; font-size: 8pt;">    </span></p><p style="padding-left: 60px;"><span style="font-family: courier new,courier; font-size: 8pt;">    </span><span style="font-family: courier new,courier; font-size: 8pt;">// here is my map with the parameter I want to pass to the jBPM process</span></p><p style="padding-left: 60px;"><span style="font-family: courier new,courier; font-size: 8pt;">    List<NameValuePair> formparams = new ArrayList<NameValuePair>();</span><br/><span style="font-family: courier new,courier; font-size: 8pt;">    formparams.add(new BasicNameValuePair("woId", "testValue"));</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">        HttpPost httpPost = new HttpPost(url);</span></p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");</span></p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">        httpPost.setEntity(entity);</span><br/><span style="font-family: courier new,courier; font-size: 8pt;">        HttpClient httpClient = new DefaultHttpClient();</span></p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">        HttpResponse response = httpClient.execute(httpPost);</span></p><p style="padding-left: 60px;"><span style="font-family: courier new,courier; font-size: 8pt;">   // the getRequestString() method is parsing the response<br/></span></p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">        return this.getRequestString(response);</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="font-family: courier new,courier; font-size: 8pt;">    }</span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And in attachement, the process BPMN file.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I don't know what is missing; in the console, it's printing:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="padding-left: 30px;"><span style="font-size: 8pt; font-family: courier new,courier;">Init data...</span></p><p style="padding-left: 30px;"><span style="font-size: 8pt; font-family: courier new,courier;">null<br/></span></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>"Init data" is the string called in "Init Data" task; null is the value of my variable.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Someone has an idea?</p></div>
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