这是因为用了一次以上（多次）mbg导致sql映射文件堆积导致的异常，删除对应的sql映射文件，然后重新生成即可。
Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for org.kinome.rm.dao.SysSysinfoMapper.BaseResultMap
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:859)
at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:831)
at org.apache.ibatis.session.Configuration.addResultMap(Configuration.java:613)
at org.apache.ibatis.builder.MapperBuilderAssistant.addResultMap(MapperBuilderAssistant.java:214)
at org.apache.ibatis.builder.ResultMapResolver.resolve(ResultMapResolver.java:47)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:285)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElement(XMLMapperBuilder.java:252)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.resultMapElements(XMLMapperBuilder.java:244)
at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:116)
异常 java.lang.IllegalArgumentException: Result Maps collection already contains value
原文：https://www.cnblogs.com/kinome/p/10109769.html