I have servlet filter that is invoked ahead of any application code that
catches all unhandled exceptions, and then it forwards request to appropriate
page depending on the exception.
I am indeed doing requestDispatcher.forward() and I set attributes on the
request that are later used in custom error jsp for presentation.
It seems to work fine for all the cases so far except with jsp:include
someservlet/ where someservlet generates runtime exception. (the browser does
get the right error page, but exceptions are logged from tomcat).
I will experiment with using response.sendError() although it's not clear how
to pass information back to the page (it appears I can only send a message) ,
such as stack trace, timestsamp of error, etc. I guess I can cramp it into
message and parse it back in the page, but It does not feel right.
I also think that I might be in danger of getting IllegalStateException since
it's possible that some info can be already written back to the client. Lets
say, I have multiple jsp:include servlet1/, jsp:include servlet2/, and
second include generated runtime exception - I suspect this might resolve in
IllegalStateException during sendError() although i haven't tested it yet.
Thank you for your responses;
-Original Message-
From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com]
Sent: Saturday, July 25, 2009 6:48 PM
To: Tomcat Users List
Subject: RE: JSPwriterImpl generates IO exception while processing
jsp:includethat gets forwarded.
From: Leonard Gestrin [mailto:leonard.gest...@markettools.com]
Subject: JSPwriterImpl generates IO exception while processing
jsp:includethat gets forwarded.
Is it illegal to forward request while processing include?
No, but it's illegal to forward a request after the response has been committed.
Are you actually doing a RequestDispatcher.forward() call, or are you using
HttpServletRequest.sendError()? The latter is the proper way to trigger the
error page.
- Chuck
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