如何在EntityManagerFactory中使用LazyLoading

Question

我试图像这样使用EntityManagerFactory：

@Service
public class UserServiceImpl implements UserService {

@Autowired
private EntityManagerFactory entityManagerFactory;

@Override
public User getByID(long id) {
    Session session = entityManagerFactory.unwrap(Session.class);       
    return (User) session.createCriteria(User.class).add(Restrictions.idEq(id)).uniqueResult();
}

...
}

但我有错误： javax.persistence.PersistenceException：Hibernate无法将EntityManagerFactory解包为＆＃39; org.hibernate.Session＆＃39;