By Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,
Firm JavaBeans 3.0 (EJB 3.0) is a crucial portion of Sun’s new light-weight Java firm version 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 when you consider that its first unencumber, EJB has been the topic of a lot media recognition and no little controversy. EJBs signify a worldly and strong know-how and EJB-based purposes can aid excessive numbers of transactions and clients, with greatest safeguard. even though, prior incarnations of EJB have grow to be seemed through many as an excessively complicated know-how that may result in high priced and time-consuming suggestions which are tough to construct, enforce and hold. the hot light-weight EJB three is decided to alter all that. It has made large advances in ease of improvement, and its tremendously simplified programming version has been extensively acclaimed and embraced. starting EJB three takes the reader in the course of the info of the EJB 3.0 structure, and exhibits how EJB can be utilized to improve robust, standards-based backend company good judgment. With 12 years of mixed EJB adventure, the authors supply many useful insights into the complete EJB structure, overlaying all parts of the EJB 3.0 specification, together with its new endurance framework, simplified improvement version, and different key new positive aspects.
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Extra resources for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
The client application invokes one or more business methods in the session bean. 3. The session bean processes the request and validates data—by interacting with databases, enterprise applications, legacy systems, and so on—to perform a certain business operation or task. 4. The session bean finally sends a response back to the client application, either through data collections or simple objects that contain acknowledgment messages. Figure 2-1. qxd 30 8/31/06 6:32 PM Page 30 CHAPTER 2 ■ EJB 3 SESSION BEANS 3-Tier Architecture for a Web Application This architecture, as shown in Figure 2-2, is typically front-ended by a web application running in the browser of a desktop or laptop machine.
Using web technologies such as JavaServer Pages (JSP), JavaServer Faces (JSF), or Java Servlets. Typical user actions, such as entering search criteria or adding certain items to the web application shopping cart, will invoke/call session beans running in an EJB container via one of the aforementioned web technologies. ). Figure 2-2. Session beans in a 3-tier architecture with a web application In the 3-tier architecture just discussed, the client application (which is the web application) and the session beans can be run within the same instance of an application server (colocated) or from different instances running on the same machine.
Qxd 8/31/06 6:32 PM Page 29 CHAPTER 2 ■ EJB 3 SESSION BEANS 3-Tier Architecture with Rich Client Figure 2-1 shows a typical architecture for a session bean in 3 tiers, with a rich client front-end application that has some data entry screens used by end users like customer service representatives, bank tellers, and so on. These client applications can be developed using Java Swing technology with the Java Platform, Standard Edition (Java SE), or they can be plain old Java objects (POJOs) that are run from the command line.