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 version five platform (Java EE 5). they're used for the improvement and deployment of component-based firm company functions equivalent to transaction-based functions. Ever considering that its first liberate, EJB has been the topic of a lot media consciousness and no little controversy. EJBs characterize a cosmopolitan and robust know-how and EJB-based functions can aid excessive numbers of transactions and clients, with greatest defense. notwithstanding, earlier incarnations of EJB have grow to be looked via many as an excessively complicated know-how which may bring about expensive and time-consuming strategies which are tricky to construct, enforce and preserve. the recent light-weight EJB three is decided to alter all that. It has made large advances in ease of improvement, and its significantly simplified programming version has been extensively acclaimed and embraced. starting EJB three takes the reader in the course of the information of the EJB 3.0 structure, and exhibits how EJB can be utilized to improve robust, standards-based backend enterprise good judgment. With 12 years of mixed EJB adventure, the authors supply many functional insights into the full EJB structure, protecting all parts of the EJB 3.0 specification, together with its new patience framework, simplified improvement version, and different key new beneficial properties.
Read Online or Download Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional) PDF
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Additional info for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
Figure 1-7. The completed Environment Variables dialog Click OK on the Environment Variables and System Properties dialogs. qxd 20 8/31/06 6:44 PM Page 20 CHAPTER 1 ■ INTRODUCTION TO THE EJB 3 ARCHITECTURE Starting and Testing the GlassFish Installation Assuming all the preceding steps have been executed successfully, you are ready to start the GlassFish application server and run a few tests to ensure that you are set to run the samples in this book. Starting GlassFish The GlassFish application server provides the asadmin command-line utility for administrative tasks including starting and shutting down the GlassFish application server domains.
In later chapters, we will augment the SearchFacade bean to access the back-end database. 3. The bean returns to the client applications the information that satisfied the search criteria. Listing 2-1 shows the definition of the SearchFacade bean. In the following sections of this chapter, we will build the code that will show the preceding workflow in action. SearchFacadeBean is a standard Java class with a class-level annotation of @Stateless. qxd 32 8/31/06 6:32 PM Page 32 CHAPTER 2 ■ EJB 3 SESSION BEANS Listing 2-1.
This allows any role (see the “EJB Roles” section later in the chapter) downstream of the bean developer to override metadata settings without having to update the Java source, since overrides can be applied exclusively to the XML descriptors. ■Note A more advanced strategy that we also recommend is to use annotations only when defining behavior on an enterprise bean or an entity that is truly integral to its definition, such as the relationship type of an entity relationship field, or the transactional requirements of a method on a session bean.
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