1 Reply Latest reply on May 24, 2013 9:21 AM by nicols

    which JMS based human task work item handler need to use ?

    vinayakpict Apr 25, 2013 2:49 AM

      hi,

       

      I want to user JMSTaskServer as transporter between JBPM 5.4 process engine and TaskClient.

      Serever is initilized as:

       

      Properties serverProperties = new Properties();
        serverProperties.setProperty("JMSTaskServer.connectionFactory", "ConnectionFactory");
        serverProperties.setProperty("JMSTaskServer.transacted", "true");
        serverProperties.setProperty("JMSTaskServer.acknowledgeMode", "AUTO_ACKNOWLEDGE");
        serverProperties.setProperty("JMSTaskServer.queueName", "tasksQueue");
        serverProperties.setProperty("JMSTaskServer.responseQueueName", "tasksResponseQueue");


        try {
            this.server = new JMSTaskServer(taskService, serverProperties, new InitialContext());
        } catch (NamingException e1) {
            e1.printStackTrace();
        }


        thread = new Thread(server);
        thread.start();

       

      The Task client for JMS is as :

       

        public static TaskService getTaskClient() {


          Properties clientProperties = new Properties();
          clientProperties.setProperty("JMSTaskClient.connectionFactory", "ConnectionFactory");
          clientProperties.setProperty("JMSTaskClient.transactedQueue", "true");
          clientProperties.setProperty("JMSTaskClient.acknowledgeMode", "AUTO_ACKNOWLEDGE");
          clientProperties.setProperty("JMSTaskClient.queueName", "tasksQueue");
          clientProperties.setProperty("JMSTaskClient.responseQueueName", "tasksResponseQueue");
          TaskService client = null;
          try {
              client = new SyncTaskServiceWrapper(new TaskClient(new JMSTaskClientConnector( UUID.randomUUID().toString() + "WSThroughJMSHumanTaskHandler" , new JMSTaskClientHandler(
                        SystemEventListenerFactory.getSystemEventListener()), clientProperties, new InitialContext())));
          } catch (NamingException e) {
              e.printStackTrace();
          }


          return client;
    }

       

      When I do the TaskSummary look up it works fine.

       

      But when i start the new process instance which having human task it fails.

      so which human task work item handler need to use.

      I have tried below but does not work

       

             CommandBasedHornetQWSHumanTaskHandler wsHumanTaskHandler = new CommandBasedHornetQWSHumanTaskHandler(knowledgeSession);
       wsHumanTaskHandler.setClient(getTaskClientInstance());
       wsHumanTaskHandler.setConnection("127.0.0.1", 5445);

       knowledgeSession.getWorkItemManager().registerWorkItemHandler("Human Task", wsHumanTaskHandler);

       

      This is CommandBasedHornetQWSHumanTaskHandler deprecated class but I have no clue which one need use.

       

      It is giving following error :

       

      Caused by: java.lang.RuntimeException: Error creating message
        at org.jbpm.task.service.jms.JMSTaskClientConnector.write(JMSTaskClientConnector.java:152) [jbpm-human-task-jms-5.4.0.Final.jar:5.4.0.Final]
        at org.jbpm.task.service.TaskClient.registerForEvent(TaskClient.java:623) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]
        at org.jbpm.task.service.hornetq.CommandBasedHornetQWSHumanTaskHandler.connect(CommandBasedHornetQWSHumanTaskHandler.java:103) [jbpm-human-tas
k-hornetq-5.4.0.Final.jar:5.4.0.Final]
        at org.jbpm.task.service.hornetq.CommandBasedHornetQWSHumanTaskHandler.executeWorkItem(CommandBasedHornetQWSHumanTaskHandler.java:111) [jbpm-h
uman-task-hornetq-5.4.0.Final.jar:5.4.0.Final]
        at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalExecuteWorkItem(JPAWorkItemManager.java:55) [drools-persistence-jpa-5
.5.0.Final.jar:5.5.0.Final]
        at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:107) [jbpm-flow-5.4.0.Final.jar:5.4.0.Final]


        at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:126) [jbpm-flow-5.4.0.Final.jar:5.4.0.Final]
        ... 42 more
Caused by: java.lang.NullPointerException
        at org.jbpm.task.service.jms.JMSTaskClientConnector.write(JMSTaskClientConnector.java:126) [jbpm-human-task-jms-5.4.0.Final.jar:5.4.0.Final]
        ... 48 more

       

       

      Please help me ....

       

      Thanks & regards,

      -vinayak