Mybatis莫名报错或Mapper.xml配置后爆红或显示The error may exist in com/jdsydwr/dao/UserMapper.java找不到Mapper接口的修改方法

报错内容

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in com/jdsydwr/dao/UserMapper.java (best guess)

java.lang.NullPointerException
    at com.jdsydwr.utils.MybatisUtils.getSqlSession(MybatisUtils.java:27)
    at com.jdsydwr.dao.UserMapperTest.getUserLike(UserMapperTest.java:12)

解决办法

在Mapper.xml中将UTF-8改为UTF8。

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