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(){
       }
}