Solved

JSP Redirection

Posted on 2004-08-03
10
4,353 Views
Last Modified: 2013-11-24
Hello everybody,

I'm working with servlets in a project. I have 5 servlets and I need the comunication between them. I am communicate them with the context and for initialize the servlets I 'm doing with the response.sendredirect(path).
The trouble that I have its that I need to redirect the servlet to a jsp. I tried with getServletContext().getRequestDispatcher("/SG_ConfigServCentral.jsp").forward(request, response); But I get an exception (java.lang.IllegalStateException: WEB2645: Cannot forward after response has been committed) and I tried with include instead of forward but didn't work too.

Can anyone help me please?

Thanks a lot
0
Comment
Question by:epadilla
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
  • 2
  • +1
10 Comments
 
LVL 7

Accepted Solution

by:
mark-b earned 34 total points
ID: 11709874
It does not sounds like you are using the request dispatcher incorrectly.  More than likely, this error message is correct in stating that you have committed the response already BEFORE your try to forward the request.

You should be able to test this by forwarding the request immeadiately (before you process any additional information) and returning.  If it works then you are indeed commiting the reponse somewhere where you should not be.

Good luck,

-Mark
0
 
LVL 1

Assisted Solution

by:wolfc
wolfc earned 33 total points
ID: 11709901
For me the following works on JBoss 3.2.2 (Tomcat 4.1):

<%@ page language="java" %>
<% response.sendRedirect(response.encodeRedirectURL("/index2.html")); %>

Make sure nothing (and I mean nothing) does something with the response before the redirect.

See Java(tm) Servlet Specification 2.3 FCS paragraph SRV.8.4
0
 

Author Comment

by:epadilla
ID: 11710486
Hello again,

Yes I did something with the response, because I did the response.sendRedirect(path of the other servlets), so my question is if I can redirect a jsp afterI worked with the response. Here is my code

public void doGet(HttpServletRequest request, HttpServletResponse response) throws
        ServletException, IOException
    {
        String stOption;
        int inOption;
        ServletContext scContext;
        HttpServletResponse htResponse;

        scContext = this.getServletConfig().getServletContext();

        stOption = request.getParameter("param0");
        inOption = Integer.parseInt(stOption);
       
        switch (inOption)
        {
            case 0:

                bsInitHostServlets(response);

                if (inServletsCounter == -1)
                {
                    asSpooler = (SG__Servlet) scContext.getAttribute("Servlet");
                    bosSpooler = (SG__Servlet2) scContext.getAttribute("Servlet2");
                    sb_InitCloseSockets();
                    tbThreadVector.inInterfaceServlet = asSpooler;
                    tbThreadVector.inInterfaceServlet2 = bosSpooler;
                }
                break;

            case 2:
                bs_voPrintSpooler();
                break;

        }
        response.setContentType(CONTENT_TYPE);

        PrintWriter out = response.getWriter();
       
        scContext.getRequestDispatcher("/jsp/SG_ConfigServCentral.jsp").include(
                request, response);


public void bsInitHostServlets(HttpServletResponse response) throws
        IOException
    {
        String stPath = "";

        stPath = bsReturnServletPath(inServletsCounter, true);

        if (stPath != "")
        {
            try
            {
                response.sendRedirect(stPath);
                inServletsCounter++;
            }
            catch (Exception e)
            {
                System.out.println(e.getMessage());
            }
        }
        else
            inServletsCounter = -1;
      }

public String bsReturnServletPath(int inServletNumber, boolean boAllSer)
    {
        String stPath = "";
        String stParam;

        if (boAllSer == true)
            stParam = "param0=0";
        else
            stParam = "param0=1";

        switch (inServletNumber)
        {
            case 0:
                stPath = "/sg_comms_servlet?" + stParam;
                break;

            case 1:
                stPath = "/sg_servlet1?" + stParam;

                break;

            case 2:
                stPath = "/sg_servlet2?" + stParam;

                break;
        }
        return stPath;
    }

Thanks a lot.
0
Transaction Monitoring Vs. Real User Monitoring

Synthetic Transaction Monitoring Vs. Real User Monitoring: When To Use Each Approach? In this article, we will discuss two major monitoring approaches: Synthetic Transaction and Real User Monitoring.

 

Author Comment

by:epadilla
ID: 11710560
Another comment, I am using the JBuilder and this exception only appear when I upload my project to iPlanet Web Server 6.0. Because when I compile in the JBuilder it works fine.

Thanks
0
 
LVL 92

Assisted Solution

by:objects
objects earned 33 total points
ID: 11710625
>  so my question is if I can redirect a jsp afterI worked with the response.

no, you cannot redirect to *anything* after writing to the response.

you appear to also process the response after a redirect has been done. You cannot do that.
0
 

Author Comment

by:epadilla
ID: 11710853

Well I need to do the following:

Servlet1 is the base of all my project, and I want that Servlet1 communicate with Servlet2 for initialize some proccess, and I need that Servlet2 return the control to Servlet1, I did it with parameters, like this:


SERVLET 1

response.sendRedirect(Path of servlet2?param=0);

SERVLET 2

response.sendRedirect(Path of Servlet1?param=0);

After that I need to display a JSP for the user.


Any other idea for try to do this??
0
 
LVL 92

Expert Comment

by:objects
ID: 11710941
doesn't sound like its a redirect you need, you cannot share processing between servlets.
once a servlet has redirected it should return.
0
 
LVL 1

Expert Comment

by:wolfc
ID: 11713011
At what line to you get the IllegalStateException, because after a sendRedirect you're not allowed to do anything as well. :-)
0

Featured Post

Turn Insights Into Action

You’ve already invested in ITSM tools, chat applications, automation utilities, and more. Fortify these solutions with intelligent communications so you can drive business processes forward.

With xMatters, you'll never miss a beat.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For beginner Java programmers or at least those new to the Eclipse IDE, the following tutorial will show some (four) ways in which you can import your Java projects to your Eclipse workbench. Introduction While learning Java can be done with…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers will learn about the different types of variables in Java and how to declare them. Decide the type of variable desired: Put the keyword corresponding to the type of variable in front of the variable name: Use the equal sign to assign a v…
This tutorial will introduce the viewer to VisualVM for the Java platform application. This video explains an example program and covers the Overview, Monitor, and Heap Dump tabs.

718 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question