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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 15:05:34 GMT
OK.  I never knew the forward call actually returned - ever.  I will
experiment with this.  I'm nearly ready to go away and stop pestering you
all, but one more question...


Say the Home servlet gets the session object from the request.
It later forwards the request to the Create servlet, which essentially
modifies the session.
Then, when the forward call returns, will the Home servlet's session object
be the old one or the updated one?  Or will it have to do
request.getSession() all over again in order to get latest session.

Cheers,

Lindsay

 -----Original Message-----
From: 	Wagoner, Mark [mailto:MWagoner@wildflavors.com] 
Sent:	08 March 2002 14:52
To:	'Tomcat Users List'
Subject:	RE: How can I resolve this "IllegalStateException: Response
has a lrea dy been committed" problem?

Actually, the way forward works came as a surprise to me as well.  And I
only figured it out after a few days of testing and head-scratching.  :)

Since the session is held in the request object, changes made to it should
be available to the original Home servlet by calling request.getSession
after the forward call returns.  Obviously I'm not real familiar with what
you are trying to do, but there may be a way you can eliminate the last
forward back to the home servlet.

-----Original Message-----
From: lindsay.hamoudi@bt.com [mailto:lindsay.hamoudi@bt.com]
Sent: Friday, March 08, 2002 9:44 AM
To: tomcat-user@jakarta.apache.org
Subject: RE: How can I resolve this "IllegalStateException: Response has
a lrea dy been committed" problem?


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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