No qualifying bean of type ‘com.oa.mapper.DeptMapper‘ available Error creating bean with name

1.报错描述

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.oa.mapper.DeptMapper’ available(最核心的报错): expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

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Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘deptServiceImpl’: Unsatisfied dependency expressed through field ‘baseMapper’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.oa.mapper.DeptMapper’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

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Error creating bean with name ‘deptController’: Unsatisfied dependency expressed through field ‘deptService’; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deptServiceImpl’: Unsatisfied dependency expressed through field ‘baseMapper’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type ‘com.oa.mapper.DeptMapper’ available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
[RMI TCP Connection(3)-127.0.0.1] ERROR org.springframework.web.context.ContextLoader - Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘deptController’: Unsatisfied dependency expressed through field 'deptService’; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name ‘deptServiceImpl’:

2.报错原因

• 没有“com.oa.mapper.DeptMapper”类型的合格bean可用
• mapper层中的XxxMapper接口文件没交给ioc容器管理(未产生对应该接口的bean)，导致当其他配置需要该bean时，产生报错，从而引起了一系列的报错！

3.解决方法

将mapper层下的 XxxMapper接口文件交给ioc容器管理。
通过 以下配置(配置MapperScannerConfigurer) 会扫描com.oa.mapper下的所有接口，然后创建各自接口的 “动态代理类”。这样，就能成功注入bean对象了。
（扫描mapper接口，注册mapper接口，生成mapper接口的“动态代理类”）

http://www.springframework.org/schema/beans/spring-beans.xsd

ps:
放在spring.xml(也叫:applicationContext.xml)配置文件 的<beans ... >中

     <!--
       把mapper层下的 XxxMapper接口文件交给ioc容器管理
      -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--  动态代理生成(反射)对象 -->
        <property name="basePackage" value="com.oa.mapper"/>
    </bean>
    
ps:
放在spring.xml(也叫:applicationContext.xml)配置文件 的<beans> ... </beans>中