spring注入通过注解方式实现

public class LoginForUserAction extends ActionSupportExtend {
 
 @Autowired
 private TbUserService tbUserService;

}

public interface TbUserService {}

@Service
public class TbUserServiceImpl implements TbUserService {
 
 @Autowired
 private TbuserDAO tbuserDAO;
}

public interface TbuserDAO {}

@Repository
public class TbuserDAOImpl extends DataAccess implements TbuserDAO {}

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在一次开发中 Action 中的Service实现类总是没有注入进来，通过仔细查找才发现，在ServiceImpl上没有添加@Service注解。。立刻悲剧类