Download EJB 3 developer guide : a practical guide for developers and by Michael Sikora PDF

By Michael Sikora

In Detail

The EJB three (Enterprise Java Beans model three) specification is a center section of enterprise-level JEE (Java Platform company version) implementations and this more desirable model is determined to simplify the advance of company Java applications.

This ebook covers the middle parts of EJB three expertise, exploring them in a concise demeanour with many aiding examples. you'll achieve a radical knowing of EJB three expertise and find out about an important beneficial properties of EJB three fast.

What you are going to examine from this book?

This ebook will train you the center parts of EJB three know-how. You will:

  • Gain a quick creation to the EJB three necessities whereas studying concerning the underlying principles
  • Create Entities, Message-Driven Beans, consultation Beans and their clients
  • Look at working an EJB purchaser from an software customer container
  • Learn the right way to package deal and set up an EJB
  • Use JQPL (Java endurance question Language)
  • Explore the entity supervisor interface
  • Learn approximately object/relational mapping with EJB 3
  • Look on the Java Messaging API and message-driven beans
  • Look at transactions, interceptors, and EJB timer services
  • Understand how EJB three differs from the 2.x version
  • Implement EJB 3's protection features


This ebook is a fast paced educational that explores the main good points of EJB three with many accompanying examples. This publication isn't an entire reference consultant, yet a concise exploration of EJB 3's middle elements.

Who this e-book is written for?

This ebook is basically aimed toward specialist builders who have already got a operating wisdom of Java. company architects and architects with a historical past in Java could additionally locate this ebook of use. past adventure of operating with Java is key and information of relational databases is desirable.

As this ebook is an advent to EJB three, it really is geared toward people who find themselves new to EJB three. because the new edition of EJB is so extensively various from the former model (EJB 2.x), the booklet is appropriate for and will be of curiosity to people who have had adventure operating with EJB 2.x. The textual content makes it transparent the place the diversities among the types of EJB lie, even if they aren't explored in detail.

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Extra resources for EJB 3 developer guide : a practical guide for developers and architects to the Enterprise Java Beans standard

Sample text

The following state diagram shows the stateless session bean's lifecycle: Does Not Exist new instance dependency injection (if any) @PostConstruct (if any) @PreDestroy (if any) Method Ready Pool business method The initial state of a stateless session bean is the does-not-exist state. This would be the case before a container starts up, for example. The next state is the method-ready pool. When the container starts up, it typically creates a number of stateless session bean instances in the method-ready pool.

Again in our example we have not specified any such metadata. 4. The container then invokes a PostConstruct callback method if one is present in the bean. Again we have not invoked such a method in our bean example. The PostConstruct method would be used for initializing any resources used by the bean. For example, the session bean may make use of a JMS queue for sending messages. The connection queue used by JMS could be initialized in the PostConstruct method. A PostConstruct method is called only once in the life of an instance, when it has transitioned from the does-not-exist state to the method-ready pool.

By having a @Remove annotated method we are freeing up container resources as soon as we have made use of them. finished(); } } [ 38 ] Chapter 2 Stateful Session Bean's LifeCycle The following state diagram shows the stateful session bean's lifecycle: Does Not Exist new instance dependency injection (if any) @PostConstruct (if any) @PreDestroy (if any) @Remove Method Ready business method timeout @PrePassivate (if any) @PostActivate (if any) Passive The lifecycle of a stateful session bean differs from that of a stateless session bean in a number of respects.

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