错误信息如下：
Exception in thread "main" org.hibernate.InvalidMappingException: Unable to read XML
at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:101)
at org.hibernate.cfg.Configuration.add(Configuration.java:510)
at org.hibernate.cfg.Configuration.add(Configuration.java:506)
at org.hibernate.cfg.Configuration.add(Configuration.java:686)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:771)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2314)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2280)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2260)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2213)
at org.hibernate.cfg.Configuration.configure(Configuration.java:2128)
at org.hibernate.cfg.Configuration.configure(Configuration.java:2107)
at StudentTest.main(StudentTest.java:17)
Caused by: org.dom4j.DocumentException: Error on line 2 of document : The processing instruction target matching "[xX][mM][lL]" is not allowed. Nested exception: The processing instruction target matching "[xX][mM][lL]" is not allowed.
at org.dom4j.io.SAXReader.read(SAXReader.java:482)
at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:75)
... 11 more
我是和视频学的，查了很久也没看出问题。郁闷呀。如果哪位大哥有学习Java更快更有效的方法，希望不吝赐教。在这里先谢谢了
哈哈,你还没给分了
贴代码，估计映射文件有问题
Exception in thread "main" org.hibernate.InvalidMappingException: Unable to read XML
main主线程里读不到XML文件 贴贴entiyt类出来看看
忘记写/
The processing instruction target matching "[xX][mM][lL]" is not allowed.
这个异常解释为：xml文件不能被解析，一般出现这样的问题在于xml格式上，并且问题多出现在xml文件的头部。总结：<?xml version="1.0" encoding="UTF-8"?>前面不要有任何其他字符，如空格、回车、换行这些否则就会出现上面的异常。
你上传整个代码吧
你实体类上有了注解，就不要配置xml映射