This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
There is a method getContext(string) in servletContext which can be used to get the foreign context. so we can use the method getRequestDispatcher to get the RequestDispatcher for resources in foreign context. But when we use the request.gerRequestDiapatcher method we get the RequestDispatcher of the current context only.
So the servletContext requestDispatcher may be helpful in some scenarios.