SpringBoot整合Mybatis扫描不到Mapper的问题

﹏ヽ暗。殇╰゛Y 2022-06-04 00:59 307阅读 0赞

闲来无事，想学学springboot,开始搭建一个项目，但是一直显示mapper扫描不到的错误：

![这里写图片描述][SouthEast]  
“Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘userController’: Unsatisfied dependency expressed through field ‘userMapper’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.minibike.bike.user.dao.UserMapper’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: \{@org.springframework.beans.factory.annotation.Autowired(required=true)\}”

**“Field userMapper in com.minibike.bike.user.controller.UserController required a bean of type ‘com.minibike.bike.user.dao.UserMapper’ that could not be found.”**  
![这里写图片描述][SouthEast 1]

于是在网上找解决方案，都是治标不治本，不得不说现在的博客质量下降的厉害，太误导人了，打开好多个都是一样的内容，难道没人遇到的错误一样，连包名和类名也一样吗？有的人抄别人博客，类名和包名都懒得换一下？

最后解决方案是在Application.java主类上加注解@MapperScan(“com.minibike.bike.user.dao”)。括号中引号里边是mapper所在包路径。

加上注解后不再报错，也能正常输出oooo  
![这里写图片描述][SouthEast 2]

第一次接触springboot，昨天下午到今早一直没找到问题所在，后来查文档、注解，然后不断尝试，最后终于解决。

当然这个只是我个人项目开发中遇到的问题解决办法，不一定通用，但是如过遇到这样的问题，也可以一试。

[SouthEast]: /images/20220604/1ad79eea396c4c2aa16199242ceb4aa6.png
[SouthEast 1]: /images/20220604/fcc478144b5c4bfcb54b2f2d981ef31a.png
[SouthEast 2]: /images/20220604/365d944b62684536a4a747b8e977831a.png