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hi, I try the taskservice code in jbpm5.3 with mysql,it occurs error as follow:

java.lang.IllegalArgumentException: Named query not found: UnescalatedDeadlines

     at org.hibernate.ejb.AbstractEntityManagerImpl.createNamedQuery(AbstractEntityManagerImpl.java:108)

     at org.jbpm.task.service.persistence.TaskPersistenceManager.getUnescalatedDeadlinesList(TaskPersistenceManager.java:174)

     at org.jbpm.task.service.persistence.TaskPersistenceManager.getUnescalatedDeadlines(TaskPersistenceManager.java:146)

     at org.jbpm.task.service.TaskServiceSession.scheduleUnescalatedDeadlines(TaskServiceSession.java:231)

     at org.jbpm.task.service.TaskService.initialize(TaskService.java:116)

     at org.jbpm.task.service.TaskService.initialize(TaskService.java:101)

     at org.jbpm.task.service.TaskService.(TaskService.java:79)

     at com.sample.TaskServer.main(TaskServer.java:26)

taskservice code:

package com.sample;

import javax.persistence.EntityManagerFactory;

import javax.persistence.Persistence;

import org.drools.SystemEventListenerFactory;

import org.jbpm.task.User;

import org.jbpm.task.service.TaskService;

import org.jbpm.task.service.TaskServiceSession;

import org.jbpm.task.service.mina.MinaTaskServer;

import bitronix.tm.resource.jdbc.PoolingDataSource;

public class TaskServer {

     /**

• @param args

      */

     public static final void main(String[] args) {

          try {

               EntityManagerFactory emfTask = Persistence.createEntityManagerFactory( "org.jbpm.task" );

               TaskService taskService = new TaskService(emfTask, SystemEventListenerFactory.getSystemEventListener());

               /*

• Add the required users

              */

             TaskServiceSession taskSession = taskService.createSession();  

             taskSession.addUser(new User("Administrator"));

             taskSession.addUser(new User("krisv"));

             /* Start Mina server for HT*/

             MinaTaskServer server = new MinaTaskServer(taskService);

             Thread thread = new Thread(server);

             thread.start();

             System.out.println("Server started ...");

          } catch (Throwable t) {

               t.printStackTrace();

          }

     }

}