Have a look at the generated source for your jsp.
Maybe tomcat is generating a out.print(SomeThing)
before your forward.
I haven't tried it with tomcat, but with gnujsp
something like
<%!
some declarations
%>
<%
some scriptlet doing a forward
%>
will lead to trouble, because it generates a out.print("\n") for the
line feed between the declaration and the scriptlet. In Gnujsp you
have to write:
<%!
some declarations
%><%
some scriptlet doing a forward
%>
Maybe this also applies to tomcat ?
> -----Urspr�ngliche Nachricht-----
> Von: Matt Goss [mailto:[EMAIL PROTECTED]]
> Gesendet: Donnerstag, 4. Januar 2001 19:22
> An: [EMAIL PROTECTED]
> Betreff: Re: IllegalStateException???
>
>
> The servlet that gets posted to performs some business logic
> via JavaBeans and then
> forwards to the display page (in this case, the confirm.jsp)
> it never gets the output
> stream and it doesn't include any other jsp's.
> <sample code>
> //save the changes and then send to confirm page
> Customer tmpcust =
> (Customer)req.getSession(false).getAttribute("tmpcust");
> try{
> logger.log("removing
> customer:"+tmpcust.getId(), logger.INFO);
> this.clist.removeCustomer(tmpcust.getId());
> logger.log("customer removed", logger.INFO);
> }catch(Exception E){
> logger.log(E, "error removing
> customer", logger.ERROR);
> req.setAttribute("msg", "error
> removing customer, check logs");
>
> this.send(req, resp,
> this.props.getProperty("error"),
> "editcustomer");
> return;
> }
> this.send(req, resp,
> this.props.getProperty("confirm"),
> "editcustomer");
> //snip
> public void send(HttpServletRequest req, HttpServletResponse
> resp, String page, String
> component) throws IOException, ServletException
> {
> RequestDispatcher rd =
> req.getRequestDispatcher("/"+component+"/"+page);
> rd.forward(req, resp);
> }
> </sample code>
> ??? any clue?
> Matt
>
> Kitching Simon wrote:
>
> > According to the sun servlet specs, you are **not allowed** to
> > do a forward operation after having called a method to get the
> > output stream, exactly as the message states.
> >
> > Are you sure you have never obtained an output stream
> > before attempting to forward to "confirm.jsp" ??
> >
> > If you have something like
> > posted data --> servlet1
> > servlet1 does "include" for "handle-data.jsp"
> > servlet1 does "forward" to "confirm.jsp"
> > then if handle-data.jsp obtains an output stream, this would
> > exactly explain the problem.
> >
> > I suspect that the first thing *any* jsp page does is grab the
> > output stream, have a look at the generated jsp code for
> > "handle-data.jsp" or whatever your equivalent is.
> >
> > If your situation is different from what I have guessed, then
> > please include more information in your next post - the page
> > you included here looks ok, so the problem is probably in the
> > upstream processing you didn't give any info about!
> >
> > Cheers,
> >
> > Simon
> >
> > > -----Original Message-----
> > > From: Matt Goss [SMTP:[EMAIL PROTECTED]]
> > > Sent: Thursday, January 04, 2001 4:23 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: IllegalStateException???
> > >
> > > Hi everyone,
> > > I just ported an applicaiton onto tomcat 3.2 that ran
> fine on JRUN 3.0.
> > > The application consists of servlets that accept form
> posts from JSP's,
> > > they process the data and then forward to other jsp pages. When I
> > > forward to a specific page, the page displays fine, but
> I'm getting an
> > > error message on my server screen :
> > > <error message>
> > > 2001-01-04 09:53:05 - Ctx( /rollout ):IllegalStateException in: R(
> > > /rollout +/editcomponent/confirm.jsp + null) Cannot forward as
> > > OutputStream or Writer has already been obtained
> > > </error message>
> > > the page is a simple confirmation page and looks like this:
> > > <jsp page>
> > > <html>
> > > <head>
> > > <title>CUSTOMER OPERATION CONFIRMATION</title>
> > > <DEFANGED_meta http-equiv="Content-Type"
> content="text/html; charset=iso-8859-1">
> > >
> > > </head>
> > > <body bgcolor="#FFFFFF">
> > > <h1>The <%=request.getParameter("cmd")%> operation was successful!
> > > :)</h1>
> > > <a href="doeditcustomer.html">Return to the Customer list</a><br>
> > > <a href="index.jsp">Return to navigation page</a>
> > > </body>
> > > </html>
> > > </jsp page>
> > >
> > > does anyone have any idea what could be causing this???
> > > Matt Goss << File: Card for Matt Goss >> << File: ATT17765.txt >>
> >
> >
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