[jboss-user] [jBPM] - which JMS based human task work item handler need to use ?

vinayak Bhadage do-not-reply at jboss.com
Thu Apr 25 02:49:36 EDT 2013


vinayak Bhadage [https://community.jboss.org/people/vinayakpict] created the discussion

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

To view the discussion, visit: https://community.jboss.org/message/810199#810199

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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
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