Catch a 404 error in Servlet

[nellydownsouth]

I am a newbie to this so please forgive me if this a dumb question.

I have a Servlet which receives a get request from a basic html form which includes a webpage url parameter. Using the parameter the Servlet redirects accordingly to the received parameter url. If the resource at the url does not exist is there a way for me to catch the 404 response in the Servlet and respond accordingly to the originating page?

Thanks