The EJB 3 (Enterprise Java Beans version 3) specification is a core component of enterprise-level JEE (Java Platform Enterprise Edition) implementations and this improved version is set to simplify the development of Enterprise Java applications.This book covers the core elements of EJB 3 technology, exploring them in a concise manner with many supporting examples. You will gain a thorough understanding of EJB 3 technology and learn about the most important features of EJB 3 quickly.What you will learn from this bookThis book will teach you the core elements of EJB 3 technology. You will:.Gain a rapid introduction to the EJB 3 essentials while learning about the underlying principles.Create Entities, Message-Driven Beans, Session Beans and their clients.Look at running an EJB client from an application client container.Learn how to package and deploy an EJB.Use JQPL (Java Persistence Query Language) .Explore the entity manager interface.Learn about object/relational mapping with EJB 3.Look at the Java Messaging API and message-driven beans.Look at transactions, interceptors, and EJB timer services.Understand how EJB 3 differs from the 2.x version.Implement EJB 3's security features ApproachThis book is a fast-paced tutorial that explores the key features of EJB 3 with many accompanying examples. This book is not a complete reference guide, but a concise exploration of EJB 3's core elements.