SpringBoot Mybatis注入异常

比眉伴天荒 2022-07-12 13:07 188阅读 0赞

这几天在研究Spring Boot框架，早Spring Boot和Mybaits结合的时候，我在Action层面住入Service的代码没有报错，但是在Service注入Mybatis的Mapper接口的时候，报了如下的错误。

java.lang.Object.wait(Native Method)
     java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
     com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
    [ERROR] 09:51:11 o.s.boot.SpringApplication => Application startup failed
    org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'iUserService': Injection of autowired dependencies failed; 
    nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.company.test.dao.UserMapper 
    com.company.test.service.impl.UserServiceImpl.userMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: 
    No qualifying bean of type [com.company.test.dao.UserMapper] found for dependency: expected at least 1 bean which qualifies as autowire candidate for 
    this dependency.
     Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues
    (AutowiredAnnotationBeanPostProcessor.java:334)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)
    	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)
    	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)
    	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:766)
    	at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)
    	at com.company.test.Application.main(Application.java:19)
    Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field:
     private com.company.test.dao.UserMapper com.company.test.service.impl.UserServiceImpl.userMapper; nested exception is org.springframework.beans.factory
    .NoSuchBeanDefinitionException: No qualifying bean of type [com.company.test.dao.UserMapper] found for dependency: expected at least 1 bean which 
    qualifie
    s as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject
    (AutowiredAnnotationBeanPostProcessor.java:573)
    	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues
    (AutowiredAnnotationBeanPostProcessor.java:331)

错误提示

UserMapper的接口没有实现类，然后我就看了  我的Spring与Mybatis的Jar包也引入了，配置也配置了，怎么会报这样的错误。

![Center][]

解决方法：

后来发现Spring Boot的main启动方法，默认扫描的是当前包下的子包类，而我的base项目和test项目包的路径不对，当我修改包路径后，

Spring Boot就可以自动扫描到配置文件，Mapper同时也注入了。

[Center]: /images/20220710/10f9ca2ab2364a389911d3befb2ffc4c.png