By Michael Sikora
Intimately The EJB three (Enterprise Java Beans model three) specification is a center part of enterprise-level JEE (Java Platform company variation) implementations and this stronger model is determined to simplify the advance of firm Java functions. This publication covers the center parts of EJB three expertise, exploring them in a concise demeanour with many assisting examples. you'll achieve a radical realizing of EJB three know-how and find out about an important beneficial properties of EJB three fast. What you'll study from this e-book? This publication will train you the middle components of EJB three know-how. You will:Gain a fast creation to the EJB three necessities whereas studying concerning the underlying principlesCreate Entities, Message-Driven Beans, consultation Beans and their clientsLook at working an EJB purchaser from an software shopper containerLearn the best way to package deal and install an EJBUse JQPL (Java patience question Language) discover the entity supervisor interfaceLearn approximately object/relational mapping with EJB 3Look on the Java Messaging API and message-driven beansLook at transactions, interceptors, and EJB timer servicesUnderstand how EJB three differs from the 2.x versionImplement EJB 3's safety features process This publication is a fast moving educational that explores the foremost good points of EJB three with many accompanying examples. This e-book isn't a whole reference advisor, yet a concise exploration of EJB 3's center components. Who this publication is written for? This publication is essentially geared toward specialist builders who have already got a operating wisdom of Java. firm architects and architects with a historical past in Java might additionally locate this ebook of use. past adventure of operating with Java is key and data of relational databases is fascinating. As this ebook is an creation to EJB three, it truly is geared toward people who find themselves new to EJB three. because the re-creation of EJB is so extensively diverse from the former model (EJB 2.x), the ebook is appropriate for and will be of curiosity to those that have had event operating with EJB 2.x. The textual content makes it transparent the place the diversities among the types of EJB lie, even though they aren't explored intimately.
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Extra resources for Ejb 3 Developer Guide
The two exceptions are @EJB, which is used for injecting EJB references and @PersistenceContext, which is used for injecting EntityManager instances. We will cover the @PersistenceContext annotation in Chapter 3. getInvokedBusinessInterface()); This uses one of SessionContext methods, namely getInvokedBusinessInterface(). This method returns the session bean interface through which the current method is invoked. TimeService. This is a rather artificial use of getInvokedBusinessInterface() since our session bean implements just one interface, namely TimeService.
There is no pool of identical bean instances, as each instance serves a single client. A stateful session bean transitions from a does-not-exist to a method-ready state as soon as a client performs a business interface lookup or a dependency injection of a bean. So this step is client, and not container initiated. Once a stateful session bean is in a method-ready state, the container performs the same steps as with a method-ready stateless session bean: 1. The bean is instantiated. 2. The container injects the bean's SessionContext, if applicable.
We shall see an example of an EAR file shortly. xml compile: run-client: [java] Time is: 03:21:17 PM BUILD SUCCESSFUL [ 27 ] Session Beans The Program Directory Structure Before we describe the Ant build scripts in more detail we will look at the directory structure in which the source code is placed. xml: This is the Ant build script itself. We will describe it in more detail shortly. properties: This file contains runtime environment property settings and is read by the Ant build script. home, which is the root directory in which GlassFish is installed.
Ejb 3 Developer Guide by Michael Sikora