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

這兩天自己搭spingmvc，總是報錯，找不到自動註冊的bean Could not autowire field: private lf.service.UserService lf.controllers.UserController.userService;  nested exception is org.springframework.beans.factory.NoSuchBeanDe

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