异 常 

org.apache.jasper.JasperException: Exception in JSP: /index.jsp:9

6: <%@ page import="com.hibernate.db.*" %>		
7: <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%> 
8: <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>
9: <%First first=(First)session.getAttribute(Comtent.First);
10: List sort=(List)session.getAttribute(Comtent.Sort);
11:  %>
12: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

起 因 

java.lang.ClassCastException: java.util.ArrayList
	org.apache.jsp.index_jsp._jspService(index_jsp.java:52)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)
	org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)
	org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)
	org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
	org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


 上面错误是因为　ＡＣＴＩＯＮ的动作　＂session.setAttribute(Comtent.First, sort);＂
和　页面的List sort=(List)session.getAttribute(Comtent.Sort);不对应，也就是无付值给Comtent.Sort！