一般这个错误是事务引起的,如果确定事务没有问题,还是有这个错,可以重写OpenSessionInViewFilter的2个方法

在myfaces的wiki里提供了OpenSessionInViewFilter的一个子类如下：
public class OpenSessionInViewFilter extends org.springframework.orm.hibernate3.support.OpenSessionInViewFilter {
      
        /**
         * we do a different flushmode than in the codebase
         * here
         */
        protected Session getSession(SessionFactory sessionFactory) throws DataAccessResourceFailureException {
                Session session = SessionFactoryUtils.getSession(sessionFactory, true);
                session.setFlushMode(FlushMode.COMMIT);
                return session;
        }
        /**
         * we do an explicit flush here just in case
         * we do not have an automated flush
         */
        protected void closeSession(Session session, SessionFactory factory) {
                session.flush();
                super.closeSession(session, factory);
        }
}