No qualifying bean of type ‘XXX‘ available

今天在学习搭建jspring boot的时候遇到这样一个错误，应该也是很多初学者遇到的问题，或者类似的问题，如图：

翻译过来就是：没有符合的bean可以使用，我的这个就是UserMapper不能用。

解决办法：一般情况下在DemoApplication中添加@MapperScan(basePackages = {"com.example.demo.mapper"})，标红的地方就是上面我所提的UserMapper的路径，添加上就好了。

这样问题就解决啦！！！

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