springboot启动报错:"Error starting ApplicationContext. To display the conditions report re-run your appl

Spring Boot启动时，报错如下：

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APPLICATION FAILED TO START
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Description:

Field deviceMapper in com.esagent.es.EsDataInit required a bean of type 'com.esagent.mapper.EmDeviceMapper' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.esagent.mapper.EmDeviceMapper' in your configuration.

网上提到的解决办法大概有以下几种

1. Application启动类包位置不对
2. 启动类未配置MapperScan
3. Mapper未配置注解@Mapper
4. yml文件未配置mybatis相关

我的话是第一种情况，所有注释为 Bean 的类都必须和 Application 启动类在同一目录下或者在 Application 启动类同级子目录下
下面的 test 目录和 test 目录下的文件不在 tata 目录下，会报错