当你的xml配置文件出问题的时候

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Exception in thread "main" java.lang.ExceptionInInitializerError
   at com.imooc.test.Test.add2(Test.java:38)
   at com.imooc.test.Test.main(Test.java:19)
Caused by: org.hibernate.InvalidMappingException: Unable to read XML
   at org.hibernate.internal.util.xml.MappingReader.legacyReadMappingDocument(MappingReader.java:375)
   at org.hibernate.internal.util.xml.MappingReader.readMappingDocument(MappingReader.java:304)
   at org.hibernate.cfg.Configuration.add(Configuration.java:516)
   at org.hibernate.cfg.Configuration.add(Configuration.java:512)
   at org.hibernate.cfg.Configuration.add(Configuration.java:686)
   at org.hibernate.cfg.Configuration.addResource(Configuration.java:769)
   at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2255)
   at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2227)
   at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2207)
   at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2160)
   at org.hibernate.cfg.Configuration.configure(Configuration.java:2075)
   at org.hibernate.cfg.Configuration.configure(Configuration.java:2054)
   at com.imooc.util.HibernateUtil.<clinit>(HibernateUtil.java:15)
   ... 2 more
Caused by: org.dom4j.DocumentException: Error on line 1 of document : 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。 Nested exception: 不允许有匹配 "[xX][mM][lL]" 的处理指令目标。
   at org.dom4j.io.SAXReader.read(SAXReader.java:482)
   at org.hibernate.internal.util.xml.MappingReader.legacyReadMappingDocument(MappingReader.java:325)

... 14 more

有些时候，我们会很郁闷的遇见这种情况，原因很无奈，是我们的某个xml配置文件首行<?xml version="1.0"?>没有顶格，而是空格了，xml解析机制，这一句必须顶格，不然编译器无法识别编译。希望可以帮到你们一点点！

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