0 Replies Latest reply on Jan 30, 2013 10:25 AM by wishmaster7

    jBPM 5.4 : Signal Event and VariableName

    wishmaster7 Newbie

      Hi all,

       

      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 :

       

      VariableName: The name of the variable that will contain the data associated with this event (if any) when this event occurs.

       

      And this doesn't help much...

       

       

      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 :

       

      POST: http://localhost:8080/gwt-console-server/rs/process/definition/myProcess/new_instance

       

      and in the json return, I get the process instance id (in this example: 57). Then I call :

       

      POST: http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData

       

      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.

       

       

       

      Here is, in my Java application, the code I use to call the POST webservice:

       

      private String requestPostService() throws Exception {

       

      String url =
      "http://localhost:8080/gwt-console-server/rs/process/tokens/57/transition?signal=receiveInitData";

         

          // here is my map with the parameter I want to pass to the jBPM process

          List<NameValuePair> formparams = new ArrayList<NameValuePair>();
          formparams.add(new BasicNameValuePair("woId", "testValue"));

       

              HttpPost httpPost = new HttpPost(url);

              UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, "UTF-8");

              httpPost.setEntity(entity);
              HttpClient httpClient = new DefaultHttpClient();

              HttpResponse response = httpClient.execute(httpPost);

         // the getRequestString() method is parsing the response

              return this.getRequestString(response);

       

          }

       

       

      And in attachement, the process BPMN file.

       

      I don't know what is missing; in the console, it's printing:

       

      Init data...

      null

       

       

      "Init data" is the string called in "Init Data" task; null is the value of my variable.

       

      Someone has an idea?