Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ssm.chapter13.mapper.RoleMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
错误原因是：少写了@Repository 注解