response.sendRedirect problem in Tomcat 5.0.18 2004-02-01 - By Ben Souther
Back
You'll need to structure your code so that you either write to the out stream
or perform a sendRedirect. There has never been a version of Tomcat that
would allow otherwise. This is the same in PHP, ASP, and I imagine any other
web scripting language.
A sendRedirect does nothing more than send back a bodyless header with a
"Location: url" parameter.
You can't send a header once you've started writing to the body of the
message. You also can't write to the body after sending a redirect (which is
why you need to add a "return" statement just after the redirect).
On Sunday 01 February 2004 06:55 am, you wrote:
> Hi Ben,
>
> Thanks for your assistance, I added "return ;" statements directly after
> the redirects but this didn't stop the errors. I am currently having the
> code checked and will let you know what eventuates.
>
> Should there be no "out.print" statements above the "response.sendRedirect"
> lines in the jsp code ?
> There are also "out.write" statements in the jsp code above the redirect
> lines, could these also cause a problem ?
>
> The code was not erroring like this when using Tomcat 4.1.24 or 5.0.16, do
> you think this is due to Tomcat 5.0.18 being more strict with syntax ?
>
> Thanks for your time,
>
> Regards
> Anthony
>
>
> From: Ben Souther <bpsouther@(protected)>
>
> >Reply-To: bpsouther@(protected)
> >To: "Tomcat Users List" <tomcat-user@(protected)>
> >Subject: Re: response.sendRedirect problem in Tomcat 5.0.18
> >Date: Sat, 31 Jan 2004 23:53:41 -0500
> >
> >On Saturday 31 January 2004 11:32 pm, you wrote:
> > > at org.apache.jsp.product_jsp._jspService(product_jsp.java:283)
> >
> >If you go into your work directory, and look at product_jsp.java line 283,
> >you will see exactly what's causing the problem.
> >
> >Without seeing your code, I can't be sure what the problem is but 99% of
> >the
> >time when I see an illegal state exception it caused by one of two things.
> >
> >Either you've written someting to the out stream before redirecting
> >(setting
> >content type or any out.print statements) or you didn't put a return
> >statement just after the redirect.
> >
> >If neither of these is the case and you can post your code, attach your
> > JSP and the product_jsp.java code I'll take a stab at it.
> >
> >-Ben
> >
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