@Mapper和@MapperScan註解，xxx required a bean of type xxx that could not be found，

搭建springboot+mybatis+mysql+maven項目，從controller-service-dao，最後寫mapper.xml，啓動以後報錯以下：java Field helloWorldDAO in com.example.demo.service.ServiceImpl.HelloWorldServiceImpl required a bean of type 'com.ex

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