交易不会因违反约束而回滚

Question

技术堆栈-休眠，春季启动1.5.10，Mysql

@Component("A")
Class A {

  @Transactional(rollbackFor = {Exception.class})
  public void process() {

    User user = new User()
    dao.persist(user);

    Employee e = new Employee ()
    dao.persist(e);
  }

Class Dao {

  @Autowired
  private SessionFactory sessionFactory;

  public void persist(Object o) throws Exception {

    sessionFactory.getCurrentSession().persist(o);
  }
}

错误：

Constant violation occurred while persist the employee object. 
Expected behavior should be that rollback entire DB stuff (should not persist user object).

当前，即使在持久保留雇员对象时发生约束冲突，它仍能成功插入用户记录。

我使用了方法级别的交易属性。

任何提示都会在违反约束时回滚整个事务。