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filters - getting IllegalStateException

ankur rathi
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Joined: Oct 11, 2004
Posts: 3830
Hi,

I have a web.xml file which has filter mapping something like this:



The code of filter class is something like this:



All filter classes has same kind of code - they redirect to a URL.

I am getting an exception here:



This exception comes when we forward or include request after response is written.

I am not able to figure out what's happening here. Please help.

Thanks.
Bauke Scholtz
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Joined: Oct 08, 2006
Posts: 2458
Simply don't run FilterChain#doFilter() or RequestDispatcher#forward() or RequestDispatcher#include() after the HttpServletResponse#sendRedirect() call.
ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
Bauke Scholtz wrote:Simply don't run FilterChain#doFilter() or RequestDispatcher#forward() or RequestDispatcher#include() after the HttpServletResponse#sendRedirect() call.



Thanks. But...

Consider a URL:

http://localhost:8001/mail/a/one

This would be redirected to:

http://localhost:8001/mail/a/two

It's the same pattern so filter called again and again and again...

It's not calling the next filter.
Bauke Scholtz
Ranch Hand

Joined: Oct 08, 2006
Posts: 2458
Just check the URL before replacing. If it is subject to replace, then replace and redirect, else continue with request.
 
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