spring事务回滚问题

如下代码是不会回滚的：

public class UserSerivceImpl implements UserService {            public add(){           this.addUser();      }            @Transactional(rollbackFor = Exception.class)       private void addUser(){       }}

改成这样可以回滚：

public class UserSerivceImpl implements UserService {      @Transactional(rollbackFor = Exception.class)      public add(){           this.addUser();      }             private void addUser(){       }}