[jboss-user] [jBPM] - NullPointerException when instantiating TaskService to start MinaTaskServer

[gvallangca]

gvallangca [https://community.jboss.org/people/gvallangca] created the discussion

"NullPointerException when instantiating TaskService to start MinaTaskServer"

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Hi,

I'm having a problem running my code to start my MinaTaskServer. I'm encountering a NullPointerException to the highlighted red line.

    @PersistenceContext(unitName = "org.jbpm.persistence.jpa")
          private EntityManager em;

     public void startMinaServer() throws Exception {
          System.out.println("********** Initializing MinaTask Server **********");
                    System.out.println("em.getEntityManagerFactory(): " + em.getEntityManagerFactory());
                    System.out.println("SystemEventListenerFactory.getSystemEventListener(): " + SystemEventListenerFactory.getSystemEventListener()); 
TaskService taskService = new TaskService(em.getEntityManagerFactory(), SystemEventListenerFactory.getSystemEventListener());
                    TaskServiceSession taskSession = taskService.createSession();
                    taskSession.addUser(new User("gvallangca"));
                    minaServer = new MinaTaskServer(taskService);
                    minaThread = new Thread(minaServer);
                    minaThread.start();
      }


This is what is written in my *persistence.xml*:

 <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <jta-data-source>java:jdbc/jbpm</jta-data-source>
        <class>org.jbpm.task.Attachment</class>
        <class>org.jbpm.task.Content</class>
        <class>org.jbpm.task.BooleanExpression</class>
        <class>org.jbpm.task.Comment</class>
        <class>org.jbpm.task.Deadline</class>
        <class>org.jbpm.task.Comment</class>
        <class>org.jbpm.task.Deadline</class>
        <class>org.jbpm.task.Delegation</class>
        <class>org.jbpm.task.Escalation</class>
        <class>org.jbpm.task.Group</class>
        <class>org.jbpm.task.I18NText</class>
        <class>org.jbpm.task.Notification</class>
        <class>org.jbpm.task.EmailNotification</class>
        <class>org.jbpm.task.EmailNotificationHeader</class>
        <class>org.jbpm.task.PeopleAssignments</class>
        <class>org.jbpm.task.Reassignment</class>
        <class>org.jbpm.task.Status</class>
        <class>org.jbpm.task.Task</class>
        <class>org.jbpm.task.TaskData</class>
        <class>org.jbpm.task.SubTasksStrategy</class>
        <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class>
        <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class>
        <class>org.jbpm.task.User</class>           
        <class>org.drools.persistence.info.SessionInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>
        <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class>
        <class>org.drools.persistence.info.WorkItemInfo</class>
        <properties>
             <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
        </properties>
  </persistence-unit>


Can anybody help me to determine what wrong or missing?
Thank you so much.
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