Caused by: java.lang.IllegalArgumentException: Result Maps collection already contains value for ...

查了网上资料
https://www.cnblogs.com/caizhen/p/9153074.html
https://blog.csdn.net/prader/article/details/80547010
https://blog.csdn.net/MonkeyBrothers/article/details/80686908
Mapper.xml文件中有重复的sql语句造成。