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From lindsay.hamo...@bt.com
Subject RE: How can I resolve this "IllegalStateException: Response has a lrea dy been committed" problem?
Date Fri, 08 Mar 2002 14:43:55 GMT
Don't think JSP is failing.  It's quite a simple JSP and has been looked at
exhaustively!

Yes, I am setting session attributes in Create servlet, for use by
create.jsp.

I am only using the session object and the request throughout my
application.  The only time I ever knew I was using the response object was
when I used response.sendRedirect(), but I don't use this anymore.  I use
the RequestDispatcher.

There are no <jsp:include> or <jsp:forward> tags being used anywhere, and my
servlets do not contribute anything to the response (apart from forwarding
it around).

Mark - your words of wisdom interest me.  I thought that... when I invoke
requestDispatcher.forward(), then control never returns (to the line
following this invocation).  So how do I go about "returning" to the Home
servlet from the "Create" servlet.  Surely I need to "forward", because the
session has changed?

I have a lot to learn here I think, but I feel I'm getting closer to the
holy grail - getting rid of this exception!


 -----Original Message-----
From: 	Attila Szegedi [mailto:szegedia@freemail.hu] 
Sent:	08 March 2002 13:56
To:	Tomcat Users List
Subject:	Re: How can I resolve this "IllegalStateException: Response
has a lrea dy been committed" problem?

I guess you JSP is failing with an uncaught exception. At that point, Tomcat
would try to send a "500 Internal Server Error" response code, but it can't
since a "200 OK" status code has already been sent (that is, the output
committed) to the client.

--
Attila Szegedi
home: http://www.szegedi.org


----- Original Message -----
From: <lindsay.hamoudi@bt.com>
To: <tomcat-user@jakarta.apache.org>
Sent: 2002. március 8. 14:45
Subject: RE: How can I resolve this "IllegalStateException: Response has a
lrea dy been committed" problem?


> The exception seems to be occurring because the Home servlet forwards more
> than once (to different locations) - first to home.jsp, then later to the
> Create servlet.
> It is definitely the fact that it is forwarding to more than one place,
that
> is causing the problem.  I know this because if I call the Login servlet
and
> fail the login authorization - this servlet consequently forwards to
> login.jsp more than once (first - to display the fresh login page, and
> second - to prompt user to try again).  This however does not give me an
> exception.
> Given that my Home servlet is like the "central" servlet, it needs to be
> capable of forwarding to a variety of places, depending on the activity
> selected by the user.
> Ryan - I have looked at create.jsp and, as far as my little mind can see,
it
> does not play with the response object at all.  All it does is get a few
> session attributes and fit them into the page using <%= blablabla %>.
Could
> that be a problem?
> This problem is not isolated to the "Create" example.  There are other
> activities the user can choose which all follow exactly the same
forwarding
> mechanism (except to different servlets), and these give exactly the same
> exception.
>
>
> Lindsay
>


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