dispatcher.forward(request, response)报错的问题，提交不起

Question

异常
十一月 15, 2013 4:30:18 下午 org.apache.catalina.core.ApplicationDispatcher invoke
SEVERE: Servlet.service() for servlet jsp threw exception
javax.el.PropertyNotFoundException: Property 'messageContent' not found on type com.mon.bean.Message
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:237)
at javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:214)
at javax.el.BeanELResolver.property(BeanELResolver.java:325)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:85)
at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:1026)
at org.apache.jsp.showMessage_jsp._jspService(showMessage_jsp.java:121)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at com.mon.servlet.GetMessage.doGet(GetMessage.java:55)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
十一月 15, 2013 4:30:18 下午 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [GetMessage] in context with path [/CompanyDailySys] threw exception [javax.el.PropertyNotFoundException: Property 'messageContent' not found on type com.mon.bean.Message] with root cause
javax.el.PropertyNotFoundException: Property 'messageContent' not found on type com.mon.bean.Message
at javax.el.BeanELResolver$BeanProperties.get(BeanELResolver.java:237)
at javax.el.BeanELResolver$BeanProperties.access$400(BeanELResolver.java:214)
at javax.el.BeanELResolver.property(BeanELResolver.java:325)
at javax.el.BeanELResolver.getValue(BeanELResolver.java:85)
at org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
at org.apache.el.parser.AstValue.getValue(AstValue.java:183)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:185)
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:1026)
at org.apache.jsp.showMessage_jsp._jspService(showMessage_jsp.java:121)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at com.mon.servlet.GetMessage.doGet(GetMessage.java:55)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
servlet代码public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
ServletContext servletContext=getServletContext();
RequestDispatcher dispatcher=null;
String messageID=request.getParameter("messageID");
MessageDao messageDao =MessageDaoFactory.createMassage();
Message message=new Message();
message =messageDao.findMessageByID(Integer.parseInt(messageID));
request.setAttribute("message", message);
dispatcher=servletContext.getRequestDispatcher("/showMessage.jsp");
dispatcher.forward(request, response);
一直没找出错来

Answer 1

我怀疑是不是在第８行就异常了，错误提示是在你的message对象里找不到messageContent这个属性

Answer 2

额　好吧　我现在觉得错误应该在页面上了/showMessage.jsp　但错误还是那个错误

Answer 3

<%@page import="com.mon.daoImpl.MessageDaoImpl"%>
<%@page import="com.mon.util.PageDetails"%>
<%@page import="com.mon.util.Page"%>
<%@page import="com.mon.dao.MessageDao"%>
<%@page import="com.mon.factory.MessageDaoFactory"%>
<%@page import="com.mon.bean.Message"%>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>企业日常事务管理系统</title>
<meta name="description" content="企业日常事务管理系统">
<link rel="stylesheet" type="text/css" href="index.css">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="Content-Language" content="zh-cn">
<meta name="robots" content="all">
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="false">
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
<!--
.STYLE1 {font-size: 16px}
.STYLE2 {
color: #CCCCCC;
font-size: 14px;
}
.STYLE3 {font-size: 14px}
-->
</head><body id="homefirst">
<div id="wrapper">
<div id="header_index"></div>

<div id="navfirst">
<ul>
<li><a href="index.jsp">首页</a></li>
<li><a href="1">消息列表</a></li>
<li><a href="newMessage.jsp">发布消息</a></li>
<li><a href="login.jsp">登录</a></li>
</ul>
</div>

<div id="maincontext">
<p>${message.messageTitle}</p>
<p>${message.messageContent}</p>    这里是传值的地方
</div>

<div id="footer">
<p>
企业日常事务管理系统。版权所有，保留一切权利。蒙ICP备06004630号
</p>
</div> </div></body>
</html>

Answer 4

jsp页面messageContent没有接收到值，断点跟下java代码看看

Answer 5

肯定不是jsp的问题
就是servlet出了问题
觉得是在message上。
之前没有用Message message=new Message();
直接用的是Message message=messageDao.findMessageByID(Integer.parseInt(messageID));        
还是错的。

Answer 6

再看看实体类里有没有messageContent，是否能完全对应上

Answer 7

Property 'messageContent' not found on type com.mon.bean.Message 

Answer 8

解决了 低端错误 context 写成content了！