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:
有兩種解決方法：
一：在mybatis的配置文件添加寫typeAliases
二：在mapper.xml裏面resultMap的Type用到那個實體類名的話就要把包名也寫上去
