Mybatis映射文件空格问题

java.lang.ExceptionInInitializerError
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in com/hzh/dao/OrderMapper.java (best guess)
### The error occurred while processing mapper_resultMap[userResultMap]
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: org.apache.ibatis.builder.BuilderException: Error creating document instance.  Cause: org.xml.sax.SAXParseException; lineNumber: 2; columnNumber: 6; 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。
 

================================================

找了半天发现是映射文件前面多了一行空格。。。去掉就不报错了