报错：Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

这两天自己搭spingmvc，总是报错，找不到自动注册的bean

Could not autowire field: private lf.service.UserService lf.controllers.UserController.userService; 

nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 

No qualifying bean of type [lf.service.UserService] found for dependency: 

expected at least 1 bean which qualifies as autowire candidate for this dependency. 

Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

建一个单元测试，看看能不能跑起来，如果能跑起来，说明是web配置错误，如果不能说明类写的有问题。

类检查方面：

1.是否在加了@Controller  @Repository @Service 注解

@Controller
@RequestMapping(value = "/user")
public class UserController {

@Service
public class UserServiceImpl implements UserService{

@Repository
public interface UserDao {

2.spring-mvc的配置中 是否自动注册了controller类

3.spring的配置中，是否注册了用到的类

4.如果用了mybatis，看看配置的路径是否正确

 

mapper的namespace是否正确

如果还跑不起来，就可能是web.xml里面丢了listener

    
        org.springframework.web.context.ContextLoaderListener
    

我的目录如下