By Michael Sikora
In Detail
The EJB three (Enterprise Java Beans model three) specification is a middle portion of enterprise-level JEE (Java Platform company version) implementations and this more suitable model is decided to simplify the improvement of company Java applications.
This e-book covers the middle components of EJB three expertise, exploring them in a concise demeanour with many helping examples. you'll achieve a radical figuring out of EJB three expertise and know about an important beneficial properties of EJB three speedy.
What you are going to study from this book?
This booklet will educate you the center parts of EJB three know-how. You will:
- Gain a quick advent 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 buyer from an software buyer container
- Learn how you can 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 safety features
Approach
This publication is a fast moving instructional that explores the foremost good points of EJB three with many accompanying examples. This publication isn't a whole reference advisor, yet a concise exploration of EJB 3's middle elements.
Who this publication is written for?
This publication is essentially geared toward specialist builders who have already got a operating wisdom of Java. company architects and architects with a historical past in Java may additionally locate this e-book of use. earlier event of operating with Java is vital and information of relational databases is desirable.
As this booklet is an creation to EJB three, it really is geared toward people who are new to EJB three. because the new edition of EJB is so appreciably various from the former model (EJB 2.x), the publication is appropriate for and may be of curiosity to people who have had event operating with EJB 2.x. The textual content makes it transparent the place the variations among the types of EJB lie, even if they don't seem to be explored in detail.
Read or Download EJB 3 developer guide : a practical guide for developers and architects to the Enterprise Java Beans standard PDF
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Additional resources for EJB 3 developer guide : a practical guide for developers and architects to the Enterprise Java Beans standard
Example text
X we need to decide whether the persistence aspects of an entity bean are handled by the container (Container Managed Persistence or CMP) or by the application (Bean Managed Persistence or BMP). In the case of CMP, the entity bean is defined as an abstract class with abstract getter and setter method definitions. At deployment the container creates a concrete implementation of this abstract entity bean class. In the case of BMP, the entity bean is defined as a class. The getter and setter methods need to be coded.
Without such a method the bean instance will continue to occupy the container's cache until a timeout period is reached. At this point the bean instance is deleted by the container. The timeout period is configured by the container's administrator. 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.
A client interacts with a session bean by invoking one or more methods defined in the bean. This sequence of method calls we call a session, hence the name session beans. The client can be a web-tier client such as a servlet or JSP page, or a standalone Java application program. x, EJB 3 session beans are a component technology. In EJB 3 a session bean component consists of a bean interface and a bean class. The bean interface provides all the bean method definitions, the bean class provides the method implementations.