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's wrong or missing?

Thank you so much.