org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML.问题思路

15:36:34,549  WARN DefaultListableBeanFactory:1416 - Bean creation exception on FactoryBean type check: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemsMapper' defined in file [F:\apache-tomcat-7.0.77\webapps\ssm0531\WEB-INF\classes\cn\com\dao\ItemsMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Wrong namespace. Expected 'cn.com.dao.ItemsMapper' but found 'cn.com.mapper.ItemsMapper'.
15:36:34,549  WARN XmlWebApplicationContext:487 - Exception encountered during context initialization - cancelling refresh attempt
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemServiceImpl': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private cn.com.dao.ItemsMapper cn.com.service.ItemServiceImpl.itemsMapper; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [cn.com.dao.ItemsMapper] 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)}
Related cause: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'itemsMapper' defined in file [F:\apache-tomcat-7.0.77\webapps\ssm0531\WEB-INF\classes\cn\com\dao\ItemsMapper.class]: Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Wrong namespace. Expected 'cn.com.dao.ItemsMapper' but found 'cn.com.mapper.ItemsMapper'.
	

在第一次常识整合SSM的时候爆了一个异常，说namespace错误，有效信息如下:

Cause: org.apache.ibatis.builder.BuilderException: Wrong namespace. Expected 'cn.com.dao.ItemsMapper' but found 'cn.com.mapper.ItemsMapper'.

我就在application-dao.xml查看是不是包扫描器有问题，找了半个小时也没看到我那里有个Mapper配的叫做cn.com.mapper.ItemsMapper，然后我就疯了，但是我冷静下来想想，既然配置的是自动包扫描，如果是手动配置的话，肯定要把接口对应的****mapper.xml配到application-dao.xml中，但是我使用的是自动扫描，那么myBatis肯定是去解析我的application-dao.xml中的一些内容，肯定包括namespace等等。

我去找了具体的***mapper.xml文件，看里面的namespace，果不其然，写成了cn.com.mapper.ItemsMapper'。

回头想想原因，我这几个***mapper.xml映射文件，是用MyBatis提供的逆向工程工具，自动生成的，然后指定的包名，和后来复制目的地的包名不一致，导致框架自动解析器解析不到对应的内容，所以就会报错。

记录一下启动成功的截图