You're looking at one of the standard
J2EE design patterns. It's described here on Sun's site:
Front Controller - J2EE Design Pattern
Use a controller as the initial point of contact for handling a request. The controller manages the handling of the request, including invoking security services such as authentication and authorization, delegating business processing, managing the choice of an appropriate view, handling errors, and managing the selection of content creation strategies.
You really should pick up the book Design Patterns. Every pattern in this book is covered on the exam:
Core J2EE Design Patterns for the SCEA5 Exam -Cameron McKenzie [ September 08, 2008: Message edited by: Cameron Wallace McKenzie ]