(EJB 3.0 introduces readers to various kinds of knowledge related to ejb3.0 development step by step through many examples from the beginning to the mastery of the practical use and development of ejb3.0. The book is divided into 16 chapters. The contents in turn include java ee overview, ejb foundation, building ejb environment, session bean, durable entity, durable entity manager, object relation mapping, jpql query, message driven bean, business, improving ejb3.0 functions, accessing ejb3.0 and ejb security from the web layer, ejb and web services, and ejb playing layer jsf. Two comprehensive examples are created, namely, the new/news management system and the personnel management system)