Mapped Statements collection already contains value for xxx
程序员文章站
2022-07-15 12:05:34
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Mapped Statements collection already contains value for com.zzu.ssm.mapper.UserMapper.findUserById
原因：
1.xml文件中有相同的id ，例如findUserById出现两次；
2.sqlSessionFactory 加载了两次相同的xml文件。
<mapper resource="mapper/UserMapper.xml" />
<mapper resource="UserMapper.xml" />