Result Maps collection already contains value for

 运行tomcat 报错

org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: java.lang.IllegalArgumentException: Result Maps collection already contains value for cn.itcast.ssm.mapper.LyItemMapper.BaseResultMap
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:120)
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.parse(XMLMapperBuilder.java:92)
    at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.loadXmlResource(MapperAnnotationBuilder.java:164)
    at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:118)
    at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:71)

通过参考本页最下面的链接：https://blog.csdn.net/nocol123/article/details/73928925

发现是这个问题：把下图的 resultType 改成 resultMap

改了后记得要tomcat clean 和 eclipse的 project clean 一下， 有时候垃圾电脑会因为缓存问题, clean 失败

这时候就要想办法换一台电脑了。

参考

 https://blog.csdn.net/nocol123/article/details/73928925