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NullPointerException when instantiating TaskService to start MinaTaskServer
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created by <a href="https://community.jboss.org/people/gvallangca">gvallangca</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/750944#750944">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm having a problem running my code to start my MinaTaskServer. I'm encountering a NullPointerException to the highlighted <span style="color: #ff0000;">red</span> line.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @PersistenceContext(unitName = "org.jbpm.persistence.jpa")</p><p>          private EntityManager em;</p><p>     </p><p>     public void startMinaServer() throws Exception {</p><p>          System.out.println("********** Initializing MinaTask Server **********");</p><p>                    System.out.println("em.getEntityManagerFactory(): " + em.getEntityManagerFactory());</p><p>                    System.out.println("SystemEventListenerFactory.getSystemEventListener(): " + SystemEventListenerFactory.getSystemEventListener()); </p><p>                    <span style="color: #ff0000;">TaskService taskService = new TaskService(em.getEntityManagerFactory(), SystemEventListenerFactory.getSystemEventListener());</span></p><p>                    TaskServiceSession taskSession = taskService.createSession();</p><p>                    taskSession.addUser(new User("gvallangca"));</p><p>                    minaServer = new MinaTaskServer(taskService);</p><p>                    minaThread = new Thread(minaServer);</p><p>                    minaThread.start();</p><p>      }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is what is written in my <strong>persistence.xml</strong>:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA"></p><p>        <provider>org.hibernate.ejb.HibernatePersistence</provider></p><p>        <jta-data-source>java:jdbc/jbpm</jta-data-source></p><p>        <class>org.jbpm.task.Attachment</class></p><p>        <class>org.jbpm.task.Content</class></p><p>        <class>org.jbpm.task.BooleanExpression</class></p><p>        <class>org.jbpm.task.Comment</class></p><p>        <class>org.jbpm.task.Deadline</class></p><p>        <class>org.jbpm.task.Comment</class></p><p>        <class>org.jbpm.task.Deadline</class></p><p>        <class>org.jbpm.task.Delegation</class></p><p>        <class>org.jbpm.task.Escalation</class></p><p>        <class>org.jbpm.task.Group</class></p><p>        <class>org.jbpm.task.I18NText</class></p><p>        <class>org.jbpm.task.Notification</class></p><p>        <class>org.jbpm.task.EmailNotification</class></p><p>        <class>org.jbpm.task.EmailNotificationHeader</class></p><p>        <class>org.jbpm.task.PeopleAssignments</class></p><p>        <class>org.jbpm.task.Reassignment</class></p><p>        <class>org.jbpm.task.Status</class></p><p>        <class>org.jbpm.task.Task</class></p><p>        <class>org.jbpm.task.TaskData</class></p><p>        <class>org.jbpm.task.SubTasksStrategy</class></p><p>        <class>org.jbpm.task.OnParentAbortAllSubTasksEndStrategy</class></p><p>        <class>org.jbpm.task.OnAllSubTasksEndParentEndStrategy</class></p><p>        <class>org.jbpm.task.User</class>           </p><p>        <class>org.drools.persistence.info.SessionInfo</class></p><p>        <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class></p><p>        <class>org.jbpm.persistence.processinstance.ProcessInstanceEventInfo</class></p><p>        <class>org.drools.persistence.info.WorkItemInfo</class></p><p>        <properties></p><p>             <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/></p><p>        </properties></p><p>  </persistence-unit></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can anybody help me to determine what wrong or missing?</p><p>Thank you so much.</p></div>
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