1、这个是编译错误：
（如果觉得错误内容太复杂，请着重解释画红线的错误！！）
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.InvalidMappingException: Could not parse mapping document from resource ch03/hibernate/User.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:575)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1593)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1561)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1540)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1514)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
at ch03.hibernate.Test.main(Test.java:15)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from input stream at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:514)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:572)
... 7 more
Caused by: org.dom4j.DocumentException: Error on line 1 of document : The processing instruction target matching [color=#FF0000]"[xX][mM][lL]" is not allowed. Nested exception: The processing instruction target matching "[xX][mM][lL]" is not allowed.[/color] at org.dom4j.io.SAXReader.read(SAXReader.java:482)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:505)
... 8 more
看了一些回答，主要是说*.hbm.xml里面的申明不正确，即这句话需要改正：
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
但是我觉得这句话没错，一定有其它原因错误，特别是上面报的错误："[xX][mM][lL]" 是什么意思？
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------解决方案--------------------
哎 看你自娱自乐的 什么叫运行Eclipse ..