org.apache.ibatis.exceptions.PersistenceException:
Error building SqlSession.
The error may exist in /mapper/UserMapper.xml
Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource /mapper/UserMapper.xml
一般是mapper配置文件的问题，请仔细检查配置路径，
或配置文件中是否多了或少了什么内容！