springboot找不到对象（自动注入失败）

一时失言乱红尘 2022-11-26 01:54 248阅读 0赞

### springboot找不到对象（自动注入失败） ###

今天在idea重新建立个springboot项目时，遇到这个奇怪的问题，说是找不到对应的bean，我猜想是@Mapper的问题

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
    2019-04-08 14:11:11.359 ERROR 7300 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
    
    ***************************
    APPLICATION FAILED TO START
    ***************************
    
    Description:
    
    Field dao in cn.niit.controller.DemoController required a bean of type 'cn.niit.TestMapper.TestMapper' 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 'cn.niit.TestMapper.TestMapper' in your configuration.
    
    
    Process finished with exit code 1

最后在网上查找后发现  
pom.xml中的依赖，我导的是mybatis,而正确的依赖应该是导入mybatis-spring-boot-starter这个依赖  
*注意：  
@Mapper这个注解引入的都是import org.apache.ibatis.annotations.Mapper;*  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDQxMA_size_16_color_FFFFFF_t_70]

最后在pom.xml加上mybatis-spring-boot-starter这个依赖就不报错了

<dependency>
    	<groupId>org.mybatis.spring.boot</groupId>
    	<artifactId>mybatis-spring-boot-starter</artifactId>
    	<version>1.1.1</version>
    </dependency>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDYyNDQxMA_size_16_color_FFFFFF_t_70]: /images/20221124/3f2e546268d14e81b546a45cf6de8b2c.png