谁能帮我看一下啦，急啊！

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: java.lang.String cannot be cast to java.util.List
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:395)
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)
cn.com.jobedu.blog.GetBlogServlet.doGet(GetBlogServlet.java:48)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.ClassCastException: java.lang.String cannot be cast to java.util.List
org.apache.jsp.displayBlog_jsp._jspService(displayBlog_jsp.java:58)
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:334)
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)
cn.com.jobedu.blog.GetBlogServlet.doGet(GetBlogServlet.java:48)
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.
Apache Tomcat/5.5.20
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ page import="cn.com.jobedu.blog.Blog"%>
<%@ page import="cn.com.jobedu.blog.Comment"%>
<%@ page import="java.util.List"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



显示博文


<% Blog blog=(Blog)request.getAttribute("blog");
List list=(List)request.getAttribute("commentList");
%>
 
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[quote] List list=(List)request.getAttribute("commentList"); [/quote]

你的commentList是个 String 不是List。

String cannot be cast to java.util.List
类型转化异常

遇到这种情况你应该查看一下异常信息，根据异常信息找到有错误的代码，我刚开始也经常遇到类型转化异常

仔细看看异常提示啊....