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转自https://blog.csdn.net/private66/article/details/80990773
刚好犯了第二个原因的错误，放同一文件夹下了。。。
完整错误： Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'file [D:\workspace_java\sdk-kit-backend\target\classes\mapper\mybatis-conf.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'file [D:\workspace_java\sdk-kit-backend\target\classes\mapper\mybatis-conf.xml]'. Cause: java.lang.NullPointerException
错误原因：一 .application.properties 中只配置了mapper.xml路径没有配置mybatis核心配置文件mybatis-conf.xml的路径
错误原因二：把mybatis核心配置文件写在了mapper.xml同一个的路径下
正确配置
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