部署ejb3出现的异常,请大家帮我看下,是jboss中部署

Question

--- MBEANS THAT ARE THE ROOT CAUSE OF THE PROBLEM ---
ObjectName: persistence.units:jar=01ttspace-entity.jar,unitName=OrderManager
  State: FAILED
  Reason: java.lang.NullPointerException
  I Depend On:
    jboss.jca:service=DataSourceBinding,name=MySqlXADS
  Depends On Me:
    jboss.j2ee:jar=01ttspace-entity.jar,name=GuessTypeDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=PrizesDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=DeliveryDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=ParticipantsDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=GuessDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=ReferenceDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=GuessResultDaoImpl,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=DemoSessionBean,service=EJB3
    jboss.j2ee:jar=01ttspace-entity.jar,name=UserDaoImpl,service=EJB3最后面的异常信息