jsp 后台报错日志；

看不出到底是什么原因，请高手帮忙分析一下，报错日志和源文件如下：
HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception org.apache.jasper.JasperException: javax.el.PropertyNotFoundException: Property 'id' not found on type java.lang.String
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
dao.UserM.doPost(UserM.java:30)
dao.UserM.doGet(UserM.java:22)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause javax.el.PropertyNotFoundException: Property 'id' not found on type java.lang.String
javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:193)
javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:170)
javax.el.BeanELResolver.property(BeanELResolver.java:279)
javax.el.BeanELResolver.getValue(BeanELResolver.java:60)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
org.apache.el.parser.AstValue.getValue(AstValue.java:114)
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:923)
org.apache.jsp.index_jsp._jspService(index_jsp.java:115)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
dao.UserM.doPost(UserM.java:30)
dao.UserM.doGet(UserM.java:22)
javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
jsp页面源文件：
 <%@ page language="java" pageEncoding="gbk"%>
<%@page import="java.util.ArrayList"%>
<%@page import="model.xinxi"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>信息表</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="信息表">
</head> <body onload="UserM">
<%
ArrayList<xinxi> message =(ArrayList<xinxi>) request
.getAttribute("xxlist");
session.setAttribute("message", "message");
xinxi xin = new xinxi();
for (int i = 0; i < message.size(); i++) {
System.out.println("++++++++++++++++++++++++++++++++++++"
+ message.get(i).getId());
}
%>
<table>
<tr>
<td>
编号
</td>
<td>
姓名
</td>
<td>
性别
</td>
<td>
密码
</td>
</tr>
<c:forEach var="message" items="${message}">
<tr>
<td>
<c:out value="${message.id}" />
</td>
<td>
<c:out value="${message.username}" />
</td>
<td>
<c:out value="${message.xb}" />
</td>
<td>
<c:out value="${message.password}" />
</td>
</tr>
</c:forEach>
</table>
</body>
</html>业务处理源文件：
package dao;import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import model.xinxi;public class UserM extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { doPost(request,response);
} public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ArrayList<xinxi> list = new ArrayList<xinxi>();
list = new User().getxinxi();
request.setAttribute("xxlist", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}}

解决方案 »

  1.   

    顶一下[color=#FF0000][/color]
      

  2.   

    Property 'id' not found on type java.lang.String
     问题出在这里吧  
     ArrayList<xinxi> message =(ArrayList<xinxi>) request
     .getAttribute("xxlist");
      session.setAttribute("message", "message");
      你看你的message 绑定了一个字符串啊.. 去掉引号! 就OK 了估计!
      

  3.   

    我改了，试了试，现在又报这个错误了！
    ++++++++++++++++++++++++++++++++++++1
    ++++++++++++++++++++++++++++++++++++2
    ++++++++++++++++++++++++++++++++++++3
    2010-4-19 17:56:58 org.apache.catalina.core.ApplicationDispatcher invoke
    严重: Servlet.service() for servlet jsp threw exception
    java.lang.NumberFormatException: For input string: "id"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    at java.lang.Integer.parseInt(Integer.java:447)
    at java.lang.Integer.parseInt(Integer.java:497)
    at javax.el.ListELResolver.coerce(ListELResolver.java:166)
    at javax.el.ListELResolver.getValue(ListELResolver.java:51)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:114)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:923)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:115)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
    at dao.UserM.doPost(UserM.java:30)
    at dao.UserM.doGet(UserM.java:22)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:619)
    2010-4-19 17:56:58 org.apache.catalina.core.StandardWrapperValve invoke
    严重: Servlet.service() for servlet UserM threw exception
    java.lang.NumberFormatException: For input string: "id"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
    at java.lang.Integer.parseInt(Integer.java:447)
    at java.lang.Integer.parseInt(Integer.java:497)
    at javax.el.ListELResolver.coerce(ListELResolver.java:166)
    at javax.el.ListELResolver.getValue(ListELResolver.java:51)
    at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:53)
    at org.apache.el.parser.AstValue.getValue(AstValue.java:114)
    at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:923)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:115)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
    at dao.UserM.doPost(UserM.java:30)
    at dao.UserM.doGet(UserM.java:22)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
    at java.lang.Thread.run(Thread.java:619)
      

  4.   

      public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
    ArrayList<xinxi> list = new ArrayList<xinxi>();
    list = new User().getxinxi();
    request.setAttribute("xxlist", list);
    request.getRequestDispatcher("index.jsp").forward(request, response);
    }
     你message的处理怎么不在dopost 里面跑到页面来处理干什么? request.getSession.setAttribute();
     页面太多的<%...%> 是不可以的  你这样处理下  如果还是不可以的话 把你的pojo(vo)类发下我看下.可能也许你里面字段 大写了  在页面有时你大写 是读不出来的 所以一般都采用小写! 谢谢!
      

  5.   

       把  request.setAttribute("xxlist", list); 改成 
           request.getSession.setAttribute("message",list);  
    然后注析掉<%ArrayList<xinxi> message =(ArrayList<xinxi>) request
     .getAttribute("xxlist");
      session.setAttribute("message", "message");%> 东西看看!  
     
      

  6.   

    是数据库dao-table映射表出问题吧