Java EE 5 Development with NetBeans 6 by David R. Heffelfinger

This book is written as a tutorial, leading you through examples to illuminate the main theory and get you working with the Entity Framework as quickly as possible. This book is for C# developers who want an easier way to create their data access layer. You will need to be comfortable with ADO.NET, but you dont need to know anything about the Entity Framework. Along the way we will create some ASP.NET applications, so being familiar with this will also help.