This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The request dispatcher can only be used for urls internal to your web application/server
If the url you are wanting to access is a completely different url again, you probably want to look at a response.redirect.