Hello!
I have a servlet EnterConstantServlet, which does some operation, which might
fail. If that operation fails, I want that the user comes to a JSP page
enterConstantFailed.jsp, where the error should be displayed.
If the operation completes successfully, the user should be redirected to JSP
page enterConstantSuccess.jsp.
The servlet code is like shown below:
| public class EnterConstantServlet extends HttpServlet {
| private static final String SUCCESS_PAGE = "enterConstantSuccess.jsp";
| private static final String FAILURE_PAGE = "enterConstantFailed.jsp";
| private static final long serialVersionUID = 1L;
|
| public EnterConstantServlet() {
| super();
| // TODO Auto-generated constructor stub
| }
|
| /**
| * @see
javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
javax.servlet.http.HttpServletResponse)
| */
| @Override
| protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
| Exception2TextualStackTrace func=null;
| PendingConstantHome home=null;
| PendingConstant pendingConstant=null;
| Context initial =null;
| String constant=null;
| Object objRef =null;
|
| /**
| * fetch name of the constant
| */
| constant=req.getParameter("constantName");
|
| /**
| * save constant in OpenCyc as pending constant
| */
| try
| {
| initial = new InitialContext();
|
| objRef = initial.lookup("java:comp/env/ejb/SimpleRoster");
|
| home = (PendingConstantHome)PortableRemoteObject.narrow(objRef,
PendingConstantHome.class);
|
| pendingConstant = home.create();
|
| pendingConstant.setPendingConstantName(constant);
|
| resp.sendRedirect(SUCCESS_PAGE);
| }
| catch (Exception exception)
| {
| func=new Exception2TextualStackTrace();
|
| System.out.println("failure reason: " +
func.evaluate(exception));
|
| resp.addHeader(FAILURE_REASON, func.evaluate(exception));
| resp.sendRedirect(FAILURE_PAGE);
| }
| }
| }
|
Note: The return value of
func.evaluate(exception)
is not null. I see this in the log file of JBoss.
I have a problem - the failure reason (parameter FAILURE_REASON in the above
code) is NOT displayed in enterConstantFailed.jsp.
enterConstantFailed.jsp looks like shown below:
| <?xml version="1.0" encoding="UTF-8" ?>
| <%--
| $Author: user $
| $Revision: 1.2 $
| $Date: 2006/04/11 20:51:35 $
| $Id: enterConstantFailed.jsp,v 1.2 2006/04/11 20:51:35 user Exp $
| $Log: enterConstantFailed.jsp,v $
| Revision 1.2 2006/04/11 20:51:35 user
| Added routine for displaying failure reason.
|
| Revision 1.1 2006/04/11 20:29:58 user
| Initial commit.
|
| --%>
| <%@ page language="java" contentType="text/html; charset=UTF-8"
| pageEncoding="UTF-8"%>
| <%@ include file="header.jsp" %>
|
| <h1>????????? ?????? ??? ????? ?????????</h1>
| <p>????? ?????? ???????? ????.</p>
| <pre><%=
request.getParameter(intranet.dapissarenko.com.WriteImageServlet.FAILURE_REASON)
%></pre>
|
| <%@ include file="footer.jsp" %>
|
What should I do in order for the failure reason to be displayed in
enterConstantFailed.jsp?
Thanks in advance
Dmitri Pissarenko
PS: This is the code of header.jsp:
| <?xml version="1.0" encoding="UTF-8" ?>
| <!--
| $Author: user $
| $Revision: 1.2 $
| $Date: 2006/04/04 21:39:40 $
| $Id: header.jsp,v 1.2 2006/04/04 21:39:40 user Exp $
| $Log: header.jsp,v $
| Revision 1.2 2006/04/04 21:39:40 user
| Added link to sanSanych.jsp.
|
| Revision 1.1 2006/04/02 22:56:57 user
| Initial commit.
|
| -->
| <%@ page language="java" contentType="text/html; charset=UTF-8"
| pageEncoding="UTF-8"%>
| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd";>
| <html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="ru" lang="ru-RU">
| <head>
| <meta http-equiv="content-type" content="application/xhtml+xml;
charset=UTF-8" />
| <meta name="author" content="haran" />
| <meta name="generator" content="haran" />
|
| <link rel="stylesheet" type="text/css" href="prosimii-screen.css"
media="screen, tv, projection" title="Default" />
| <link rel="stylesheet alternative" type="text/css"
href="prosimii-print.css" media="screen" title="Print Preview" />
| <link rel="stylesheet" type="text/css" href="prosimii-print.css"
media="print" />
|
| <title>?????????? ???? ??????? ?????????</title>
| </head>
|
| <body>
| <!-- For non-visual user agents: -->
| <div id="top"><a href="#main-copy" class="doNotDisplay
doNotPrint">Skip to main content.</a></div>
|
| <!-- ##### Header ##### -->
|
| <div id="header">
| <div class="superHeader">
| <span></span>
| <a href="http://dapissarenko.com"; title="Dmitri
Pissarenko">??????????? ???? ??????? ?????????</a>
| </div>
|
| <div class="midHeader">
| <h1 class="headerTitle" lang="la">??????? ?????????</h1>
| <div class="headerSubTitle">
| ?????????? ????
| </div>
|
| <br class="doNotDisplay doNotPrint" />
|
|
| </div>
|
| <div class="subHeader">
| <span class="doNotDisplay">Navigation:</span>
| <a href="enterTime.jsp">?????? ????? ??????</a> |
| <a href="sanSanych.jsp">??? ?????</a> |
| <a href="./index.html">?????????? ???????????</a>
| </div>
| </div>
|
| <!-- ##### Main Copy ##### -->
|
| <div id="main-copy">
| <div class="rowOfBoxes">
| <div class="twoThirds noBorderOnLeft">
|
PPS: This is the code of footer.jsp:
| <?xml version="1.0" encoding="UTF-8" ?>
| <!--
| $Author: user $
| $Revision: 1.2 $
| $Date: 2006/04/02 23:07:06 $
| $Id: footer.jsp,v 1.2 2006/04/02 23:07:06 user Exp $
| $Log: footer.jsp,v $
| Revision 1.2 2006/04/02 23:07:06 user
| Fixed encoding problems.
|
| Revision 1.1 2006/04/02 22:56:57 user
| Initial commit.
|
| -->
| <%@ page language="java" contentType="text/html; charset=UTF-8"
| pageEncoding="UTF-8"%>
| <!-- ##### Main text comes here ##### -->
|
| </div>
| </div>
| </div>
|
| <!-- ##### Footer ##### -->
|
| <div id="footer">
| <span class="doNotPrint">
| ?? ???? ???????? ?????? ???? ???????? ?????? ?? ????
| <a href="mailto:[EMAIL PROTECTED]">[EMAIL PROTECTED]</a><br />
| </span>
|
| <strong>???????? ??????? ยป</strong> <%=
java.text.DateFormat.getDateTimeInstance(java.text.DateFormat.DEFAULT,
java.text.DateFormat.DEFAULT, new java.util.Locale("ru")).format(new
java.util.Date()) %>
| </div>
| </body>
| </html>
|
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