Mapped Statements collection already contains value for com.wen.mapper.ProjectMapper.xxx

mybatis报错 Mapped Statements collection already contains value for com.wen.mapper.ProjectMapper.xxx

一般三个原因：

1. id 重复

2. parameterMap改成parameterType...

3 .parameterType参数有问题 Mapped Statements collection already contains value for com.wen.mapper.ProjectMapper.xxx

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