在刚刚学习Hibernate时运行出现了下边的错误：
Exception in thread "main" org.hibernate.MappingException: Could not read mappings from resource: com/j2ee/hibernate/User.hbm.xml
at org.hibernate.cfg.Configuration.addClass(Configuration.java:506)
at com.j2ee.hibernate.UserClient.<init>(UserClient.java:10)
at com.j2ee.hibernate.UserClient.main(UserClient.java:55)
Caused by: org.hibernate.MappingException: Could not parse mapping document in input stream
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:431)
at org.hibernate.cfg.Configuration.addClass(Configuration.java:503)
... 2 more
Caused by: org.dom4j.DocumentException: Error on line 1 of document : The processing instruction must begin with the name of the target. Nested exception: The processing instruction must begin with the name of the target.
at org.dom4j.io.SAXReader.read(SAXReader.java:482)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:422)
... 3 more
发现是**.hbm.xml文件的错误如图：
点击错误提醒，错误提示为：
The processing instruction must begin with the name of the target
解决方法：将？与xml之间的空格消除，就能顺利运行了。
希望能帮到各位小伙伴......