mybatis出现此异常，可能是因为 ***Mapper.xml 文件中存在重名对象，一不小心重复启动了mybatis的逆向工程。
以为会覆盖掉以前生成的，没想到是新生成的和之前生成的重复了
解决：把重复命名的id删除，或者删除xml文件重新使用逆向工程（推荐）。由此，项目就能正常启动了。。。
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