Markus Marzetta wrote:
>
> Hi!
>
> I have a potentially unbounded JSP displaying the results of a search
> and would like to define an error page for it using e.g.
>
> <%@ page errorPage="jspErrorPage.jsp" isErrorPage="false" %>
>
> 1st problem: if the generated page grows and exceeds the buffer size,
> the buffer is flushed and, on exception, the error page is not
> displayed because an IllegalStateException occurs on the way.
>
> java.lang.IllegalStateException: Cannot forward as OutputStream
> or Writer has already been obtained
>
> so I tried setting
>
> <%@ page autoFlush="false" %>
>
> 2nd problem: now, if the size of the generated page exceeds the buffer
> size we obviously get
>
> java.io.IOException: Error: JSP Buffer overflow
>
> Question: How to solve these problems?
> --------
The best (only, at least for now) solution is to set a very large
buffer size or somehow limit the amount of output your JSP page can
generate.
> Maybe "buffer=none" solves the problem: Does anyone have experiences
> (perhaps even figures) on the costs in terms of performance?
No, with "buffer=none" there's no buffering at all so you will
get the java.lang.IllegalStateException as soon as an attempt is
made to forward to the error page.
> Thanks in advance,
> Markus
>
> P.S. I'm using Tomcat.
In Tomcat 3.2 (at least I believe it made it into Beta 8), the error
handling has been modified so that if a forward can not be made
(due to a committed response resulting in IllegalStateException),
the error message will be "included" instead. I'm not 100%, but I
believe this applies to custom error pages as well. It's not perfect,
but it's better than the current situation. Try out Beta 8 and see how
it works for you.
Hans
--
Hans Bergsten [EMAIL PROTECTED]
Gefion Software http://www.gefionsoftware.com
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