org.apache.ibatis.binding.BindingException: Type interface com_atguigu.mybatis.mapper.UserMapper is not known to the MapperRegistry.

回答: 这个问题是由于核心配置文件中加载映射文件的包名写错导致的。具体来说，错误的包名是"com_atguigu.mybatis.mapper.UserMapper"，而正确的包名应该是"com.atguigu.mybatis.mapper.UserMapper"。这个错误会导致MyBatis无法识别到UserMapper接口。解决这个问题的方法是将包名修改为正确的形式，即将"com_atguigu.mybatis.mapper"改为"com.atguigu.mybatis.mapper"。这样就能够正确加载映射文件并解决该异常。\[1\]\[2\]\[3\]
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