By Michael Sikora
The EJB three (Enterprise Java Beans model three) specification is a center section of enterprise-level JEE (Java Platform company variation) implementations and this more suitable model is determined to simplify the advance of firm Java applications.
This publication covers the center parts of EJB three expertise, exploring them in a concise demeanour with many assisting examples. you'll achieve an intensive realizing of EJB three know-how and find out about an important positive factors of EJB three speedy.
What you'll research from this booklet?
This booklet will educate you the middle components of EJB three expertise. you'll:
- Gain a swift advent to the EJB three necessities whereas studying in regards to the underlying principles
- Create Entities, Message-Driven Beans, consultation Beans and their clients
- Look at working an EJB buyer from an software shopper container
- Learn the best way to package deal and install 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 e-book is a fast paced instructional that explores the main positive aspects of EJB three with many accompanying examples. This ebook isn't really an entire reference advisor, yet a concise exploration of EJB 3's middle elements.
Who this publication is written for?
This booklet is essentially geared toward specialist builders who have already got a operating wisdom of Java. company architects and architects with a heritage in Java might additionally locate this booklet of use. prior adventure of operating with Java is key and information of relational databases is desirable.
As this e-book is an advent to EJB three, it truly is aimed toward people who find themselves new to EJB three. because the re-creation of EJB is so notably assorted from the former model (EJB 2.x), the e-book is acceptable for and may be of curiosity to those that have had event operating with EJB 2.x. The textual content makes it transparent the place the variations among the models of EJB lie, even if they aren't explored in detail.
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Additional info for EJB 3 Developer Guide: A Practical Guide for developers and architects to the Enterprise Java Beans Standard
This proxy intercepts method calls and provides the container services such as transaction management and security. Session beans come in two flavors: stateless and stateful. We will start with an example of a stateless session bean. Stateless Session Beans A stateless session bean's state spans a single method call. We cannot have method A updating an instance variable x say, and expect the updated value of x to be available for any subsequent method invocation. This holds true both for a new method B which accesses x, or indeed, if method A is invoked a second or subsequent time.
We will discuss detached entities in Chapter 6. At this point we remind the reader that, as throughout EJB 3, XML deployment descriptors are an alternative to entity metadata annotations. x Entity Beans An EJB 3 entity is a POJO and not a component, so it is referred to as an entity and not an entity bean. x the corresponding construct is an entity bean component with the same artifacts as session beans, namely an XML deployment descriptor file, a remote or local interface, a home or localhome interface, and the bean class itself.
We show an example of these later in this chapter. Note that all annotations within an entity, other than class level annotations, must be all property-based or all field-based. The final requirement for an entity is the presence of a no-arg constructor. Serializable interface. This is not essential, but good practice because the Customer entity has the potential of becoming a detached entity. Detached entities must implement the Serializable interface. We will discuss detached entities in Chapter 6.
EJB 3 Developer Guide: A Practical Guide for developers and architects to the Enterprise Java Beans Standard by Michael Sikora