The GateIn Cookbook is out! As an invited reviewer, I reviewed this book as Java EE Expert. Buy the book from http://tinyurl.com/cybxl88
The goal of the book is to show GateIn as an open source website framework piece by piece. Starting with simple recipes, you will see each step analyzed with code examples and images, before progressing to more advanced recipes.
This GateIn Cookbook will help you with a quick approach to building portals.