By Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,
Company JavaBeans 3.0 (EJB 3.0) is an important component to Sun’s new light-weight Java company variation five platform (Java EE 5). they're used for the improvement and deployment of component-based firm company purposes corresponding to transaction-based functions. Ever due to the fact that its first unlock, EJB has been the topic of a lot media realization and no little controversy. EJBs characterize a worldly and robust know-how and EJB-based functions can aid excessive numbers of transactions and clients, with greatest protection. despite the fact that, earlier incarnations of EJB have turn out to be looked via many as a very advanced expertise which could bring about high priced and time-consuming strategies which are tough to construct, enforce and preserve. the hot light-weight EJB three is decided to alter all that. It has made large advances in ease of improvement, and its greatly simplified programming version has been commonly acclaimed and embraced. starting EJB three takes the reader in the course of the information of the EJB 3.0 structure, and indicates how EJB can be utilized to increase strong, standards-based backend enterprise common sense. With 12 years of mixed EJB adventure, the authors provide many sensible insights into the complete EJB structure, masking all parts of the EJB 3.0 specification, together with its new patience framework, simplified improvement version, and different key new positive factors.
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Extra resources for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
Typically, in order to perform user tasks or process requests from client applications, the business methods in the session bean require one or more types of resources. These resources can be other session beans, data sources, or message queues. The resources that the stateless session bean is trying to use can be injected using annotations or deployment descriptors. Resources can be acquired by annotation of instance variables or annotation of the setter methods. Listing 2-5 shows an example of setter and instance variable–based injection of myDb, which represents the data source.
In the “How This Book Is Organized” section, we provided a summary of each chapter to illustrate the general flow of the chapters, and to help you decide which areas to focus on first, should you wish to read the chapters out of sequence. The chapter concluded with a “Getting Started” section to help you install and configure the GlassFish Java EE reference implementation, set up required environment properties, and verify that the installation was successful. With this, you now have the required software infrastructure to run the code samples in this book and examine the many features of EJB 3 over the following chapters.
EJB was born to fill this need. Over the past 10 years, it has evolved to encompass numerous features (while ejecting others) and has matured into a robust and standard framework for deploying and executing business components in a distributed, multiuser environment. What Is EJB? EJB 3 is defined by JSR 220: Enterprise JavaBeans 3. Whereas the previous versions of EJB were captured in a single document, this JSR now spans three documents (listed following). The first document provides a synthesis of the high-level features of the new release, and focuses on the new simplified development model for building EJB components.
Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional) by Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,