RequestDispatcher include throws IllegalStateException?

First, note that the Spec (SRV.8.3) mentions about target servlet. But then the API mentions (Servlet, JSP or HTML) can be used in the include(...) method.
When I use a HTML file, I get
IllegalStateException......getOutputStream() has already been called for this response
Any help is appreciated.
Thanks.
- satya

This is the one I cannot recreate.
It runs, but no output from the included html file is shown.

Guy

Maybe there's something in the log files, could you please check. Also if your borwser is using a user-friendly error page then you might want to turn it off. If you see a blank page, you could also try "View Source" and see what response you got back.
I was running with Tomcat 4.0.1 on WinNT.
Thanks.
- satya

satya - There is nothing in either 'catalina.out' or the daily 'localhost' log file regarding the request/response. I 'tail -f' these in separate terminals as the system runs, very easy to see.
I even put in a System.out.println in the scriptlet as a sanity check, that shows in 'catalina.out'.
I have no new ideas on this problem at present.
Regards, Guy

What does the "view source" show?
Thanks for checking.
- satya

Satya would u check your servlet code that is translated from jsp ? ( I can't do any test on this machine that I am responding from , has nothing loaded, which is related to Java

)

Generated Servlet code:
Currently, using Tomcat 4.0.1 on Windows 98.
Thanks.
- satya

public void _jspService(HttpServletRequest request, HttpServletResponse  response)
        throws java.io.IOException, ServletException {
        JspFactory _jspxFactory = null;
        PageContext pageContext = null;
        HttpSession session = null;
        ServletContext application = null;
        ServletConfig config = null;
        JspWriter out = null;
        Object page = this;
        String  _value = null;
        try {
            if (_jspx_inited == false) {
                synchronized (this) {
                    if (_jspx_inited == false) {
                        _jspx_init();
                        _jspx_inited = true;
                    }
                }
            }
            _jspxFactory = JspFactory.getDefaultFactory();
            response.setContentType("text/html;charset=ISO-8859-1");
            pageContext = _jspxFactory.getPageContext(this, request, response,
"", true, 8192, true);
            application = pageContext.getServletContext();
            config = pageContext.getServletConfig();
            session = pageContext.getSession();
            out = pageContext.getOut();
            // HTML // begin [file="/jsp-intro/TestReqDispIncl.jsp";from=(0,0);to=(7,0)]
                out.write("<HTML>\r\n<HEAD>\r\n<TITLE>Test RequestDispatcher........</TITLE>\r\n</HEAD>\r\n<BODY>\r\n<H3>Test RequestDispatcher........</H3>\r\nHello..................1.2 JSP SPEC<BR>\r\n");
            // end
            // begin [file="/jsp-intro/TestReqDispIncl.jsp";from=(7,2);to=(10,0)]
                 
                RequestDispatcher rd = request.getRequestDispatcher("/jsp-intro/junk.html");
                rd.include(request, response); 
            // end
            // HTML // begin [file="/jsp-intro/TestReqDispIncl.jsp";from=(10,2);to=(15,0)]
                out.write("\r\n<BR>\r\nThe end!!!!!!!!\r\n</BODY>\r\n</HTML>\r\n");
            // end
        } catch (Throwable t) {
            if (out != null && out.getBufferSize() != 0)
                out.clearBuffer();
            if (pageContext != null) pageContext.handlePageException(t);
        } finally {
            if (_jspxFactory != null) _jspxFactory.releasePageContext(pageContext);
        }
    }

I tried satya's code and got the same IllegalStateException.
I thought about it for sometime as why the buffer is getting flushed.
Then I tried the following and it worked fine.

Can you please try it ?
I remember it works on weblogic. I shall try it tomorrow on Weblogic and let you know.
-Srini

I'm using Tomcat 4.0.1 on windows 2000
Here's the code I used.

-srini

and line 71 equals to this line:

it is crashing when it is trying to release the page context !

I thought about it for sometime as why the buffer is getting flushed.
Then I tried the following and it worked fine.
buffer="none"

So what are you trying to say?

If you use buffer="none", the container should flush. If not, the default buffer="8kb" atleast, and so the page maynot be flushed.

Can someone try it one other web apps and let me know, please.
Thanks.
- satya
ps:
I am willing to take anyone of these explanations:
1. The API/Spec again screwed up.
2. Its a bug in Tomcat 4.0.1
and no don't try to blame it on Microsoft or Jupiter-Mercury-Pluto alignment!

Couple more comments..............
1. The result is the same even when you forward to a HTML page.
2. It (both) works okay if you rename the "junk.html" to "junk.jsp".

- satya

satya - This phenomenon is being chatted about in the 'tomcat-users' group.
I have not yet had time to absorb all the details of those conversations yet. Use "flush" as keyword for search.
Check it out at:
tc users archives
Regards, Guy

I tried the running code on tomcat 4.0.1 and windows 2000 - but am not able to reproduce the exception.
Only thing was it only showed the included file so tried to flush the data and it showed the lines above and below the included file.
<HTML>
<HEAD>
<TITLE>Test RequestDispatcher........</TITLE>
</HEAD>
<BODY>
<H3>Test RequestDispatcher........</H3>
Hello..................1.2 JSP SPEC<BR>
<%
out.flush();
RequestDispatcher rd = request.getRequestDispatcher("/jsp/index.html");
rd.include(request, response);
%>
<BR>
The end!!!
</BODY>
</HTML>

My opinion is there are definite bugs/inconsistencies in TC 4.01 here.
eresin's stack trace in a previous message does not match the source code line numbers in my system (built from sources, not the binary D/L). So I don't get the exceptions everyone else is.
Again, this is currently a common theme on the TC user's discussion group.
Later, Guy

Here is the answer I got from apache

Jasper is using a writer to output the page, but the default servlet (used in the include) will use the output stream if it can.
So it doesn't work (it's forbidden by the servlet API). Flushing before the include should fix it.

[ March 21, 2002: Message edited by: ersin eser ]

Thanks for following up ersin.

- satya