springboot報錯：expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

springboot Controller中引用

@Autowired
    private IXxxService xxxService;

　報錯;expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

   解決：

XxxServiceImpl 前加 @Service 注解。