Field userMapper in com.example.demo.serviceImpl.UserServiceImpl required a bean of type ‘com.exampl

傷城~ 2024-04-06 10:36 29阅读 0赞

## 问题 ##

springboot项目启动报错  
Field userMapper in com.example.demo.serviceImpl.UserServiceImpl required a bean of type ‘com.example.demo.mapper.UserMapper’ that could not be found.

### 详细问题 ###

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
    2022-09-18 10:24:22.984 ERROR 40276 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
    
    ***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    Field userMapper in com.example.demo.serviceImpl.UserServiceImpl required a bean of type 'com.example.demo.mapper.UserMapper' 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.example.demo.mapper.UserMapper' in your configuration.
    
    
    Process finished with exit code 1

### 解决方案 ###

1 检查是否添加 M a p p e r S c a n ( ) MapperScan() MapperScan()注解

2 检查添加 M a p p e r S c a n ( ) MapperScan() MapperScan()注解中的 m a p p e r mapper mapper路径是否正确, 即是否为项目的mapper路径  
![请添加图片描述][acd138b671574b658e1532671869f019.png]

### 原因 ###

在Springboot启动类上添加 M a p p e r S c a n ( ) MapperScan() MapperScan()注解, 指定要变成实现类的接口所在的包，  
作用是将包下面的所有接口在编译之后都会生成相应的实现类。  
若不添加该注解， 无法找到实现类就会产生上述报错。

### 参考文献 ###

[MapperScan注解详解][MapperScan]

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![在这里插入图片描述][9cb4cb80a18345158f8a69e2f196e5b9.png]

[acd138b671574b658e1532671869f019.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/e96f26d8669e46e48871196f6d18bd01.png
[MapperScan]: https://blog.csdn.net/weixin_44093802/article/details/115601973
[9cb4cb80a18345158f8a69e2f196e5b9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/06/f93ab9572c1d47b68d732de2437bfc91.png

Field userMapper in com.example.demo.serviceImpl.UserServiceImpl required a bean of type ‘com.exampl

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