SpringBoot报错Unsatisfied dependency expressed through field userMapper和Whitelabel Error Page解决方案

搜索下面的错误信息得到解决方法

Unsatisfied dependency expressed through field 'userMapper'

项目结构如下

解决办法
在启动类中加入注解
里面填写的是mapper 的路径

@ComponentScan(basePackages={"com.example.demo.mapper"})

启动项目的问题已经解决，但是现在是404，没有找到文件

还是需要在启动类中包含进来controller的文件

@ComponentScan(basePackages={"com.example.demo.mapper","com.example.demo.controller"})

参考博客
SpringBoot 出现Whitelabel Error Page 解决办法

然后遇到的问题是：分页列表又是404

解决方法
注意pagehelper的版本

之前使用3.7.5，运行不报错误就是404，改成4.1.6之后开始报出html的语法错误，修改之后成功运行

<dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>4.1.6</version></dependency>

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