一、这个错误,表示Mapper.xml文件中的 resultMap 这个映射类的 id 重名了
**Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for com.cc.dao.StudentMapper.StudentTeacher
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:947)
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:903)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:660)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:209)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:289)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:253)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:245)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118)
... 34 more
**
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