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forwarding a request a second time

 
Sven Anderson
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Hi all,
I'm working on a small servlet application and I've got the following problem with my code:
Ive got a dispatcher servlet that redirect all user requests to various servlets etc.
the problem I have with the following code is that I want to do a second forwarding to another servlet after I've done the first one. Alternatively I would like to call my dispatcher servlet again and pass a new parameter so that my first "else if" statement is triggered. I'm stucked with this problem and dont know how to continue.
else if(userRequest.equals("openForum"))
{
String redirectTo ="/servlet/ListTopicsMessages";
RequestDispatcher dispatcher = req.getRequestDispatcher(redirectTo);
dispatcher.forward(req, res);
}
else if(userRequest.equals("postTopic"))
{
String redirectTo ="/servlet/ForumOperations";
RequestDispatcher dispatcher = req.getRequestDispatcher(redirectTo);
dispatcher.forward(req, res);
// I want to do a second forwarding here to my ListTopicsMessages servlet
}

I would be very happy If someone would be able to help me with this
Regards
Erik
 
Brahim Bakayoko
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Use filters along with a response wrapper.
The problem you are having is that one of the fowarded to servlet commits the response. Using a HttpServletResponseWrapper in a filter will fix your design issue. Note that you can have multiple filters that will call each another in succession based on your filters mapping.
 
Sven Anderson
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Thanks for you quick reply.
I'm actually reading about filters right now in the JWSDP tutorial section.
The reason I want to do a second forward is to after the "update" in the DB direct the user back to the newly updated list of topics (which is what I'm displaying)
Cheers
Erik
 
It is sorta covered in the JavaRanch Style Guide.
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