### Error building SqlSession. ### The error may exist in sqlmap/User.xml
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org.apache.ibatis.exceptions.PersistenceException: ### Error building SqlSession.### The error may exist in sqlmap/User.xml### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class. Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias ''. Cause: java.lang.ClassNotFoundException: Cannot find class:有两种解决方法：
一：在mybatis的配置文件添加写typeAliases
二：在mapper.xml里面resultMap的Type用到那个实体类名的话就要把包名也写上去
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