Faces servlet exception with forwarding

[henri delbrouck]

With MyFaces 1.0.9 and Tomcat 5.0.28, I have activated a filter.

Within this filter, I call a method which check if the user has already been authenticated. If he is not authenticated, there is a forward to an external system for authentication (CAS system).

Withe the faces servlet, I receive the following error:
"cannot not forward after response has already been committed".

This does not happen with normal JSP pages. The forwarding occurs successfully.

Could anybody help me what is wrong and what is the solution to avoid this problem.

Thank you in advance

Henri-Philippe Delbrouck

[Varun Khanna]

How does the code in your filter look like?

[Gregg Bolinger]

Usually, you'll get this message when you have tried to forward the request somewhere more than once in a servlet. So if you had something like:

if (test1){
   request.getRequestDispatcher("/page1.jsp").forward(request, response);
}else if (test2){
   request.getRequestDispatcher("/page2.jsp").forward(request, response);
}

What you will want to do is set whatever parameters you need in the if/else and then foward only once.