hibernate,java.lang.ExceptionInInitializerError 这个错误，谁遇到过。

  type Exception report
 
  message
 
  description The server encountered an internal error () that prevented it from fulfilling this request.
 
  exception
 
  javax.servlet.ServletException: Servlet execution threw an exception
 
 
  root cause
 
  java.lang.ExceptionInInitializerError
  com.sonic.HibernateUtil.<clinit>(HibernateUtil.java:14)
  com.sonic.struts.action.LoginAction.execute(LoginAction.java:54)
  org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
  org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
  org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
  org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 
 
  note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
 
  跟踪到
  com.sonic.HibernateUtil.<clinit>(HibernateUtil.java:14)
  com.sonic.struts.action.LoginAction.execute(LoginAction.java:54)
  分别是
  HibernateUtil中：
  throw new ExceptionInInitializerError(ex);
  LoginAction中:
  Session session = HibernateUtil.Session();   
   

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是不是配置文件的设置有问题或者放置的路径不对，因为我看你应该使用的是默认路径。
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创建hibernate的sessionFactory没有成功，大都是你的hibernate.cfg.xml有问题
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这个hibernate.cfg.xml应该是放错了位置