By Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,
Company JavaBeans 3.0 (EJB 3.0) is an important part of Sun’s new light-weight Java company variation five platform (Java EE 5). they're used for the advance and deployment of component-based company company purposes equivalent to transaction-based purposes. Ever given that its first unlock, EJB has been the topic of a lot media recognition and no little controversy. EJBs symbolize a worldly and strong expertise and EJB-based purposes can help excessive numbers of transactions and clients, with greatest safety. although, earlier incarnations of EJB have grow to be appeared by way of many as an excessively complicated expertise which may bring about expensive and time-consuming strategies which are tough to construct, enforce and retain. the recent light-weight EJB three is determined to alter all that. It has made large advances in ease of improvement, and its greatly simplified programming version has been largely 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 enhance strong, standards-based backend company common sense. With 12 years of mixed EJB event, the authors provide many functional insights into the full EJB structure, protecting all components 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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Additional info for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
Similar to complaints over having to define XML metadata to specify even the most basic bean behavior, developers found it burdensome to have to write custom interfaces to handle an enterprise bean’s factory support, and inconvenient to require a session bean’s interfaces to extend EJBspecific interfaces. All these limitations have been addressed in EJB 3. Home methods are no longer mandated, although they’re still supported. For session beans and MDBs, a default constructor replaces the no-argument ejbCreate() method required by earlier EJB specs.
Stateful beans can be seen as extensions to client programs that are running on the server. We will drill down into more specifics of stateless and stateful beans in the following sections. When Do You Use Session Beans? Session beans are used to write business logic, maintain a conversation state for the client, and model back-end processes or user tasks that perform one or more business operations. Typical examples include the following: • A session bean in a human resources application that creates a new employee and assigns the employee to a particular department • A session bean in an expense reporting application that creates a new expense report • A session bean in an order entry application that creates a new order for a particular customer • A session bean that manages the contents of a shopping cart in an e-commerce application • A session bean that leverages transaction services in an EJB 3 container (removing the need for an application developer to write the transaction support) • A session bean used to address deployment requirements when the client applications are not colocated on the same server • A session bean that leverages the security support provided by the container on the component or method level Session beans can be used in traditional 2-tier or 3-tier architectures with professional/ rich client applications, or in 3-tier web-based applications.
Qxd 16 8/31/06 6:44 PM Page 16 CHAPTER 1 ■ INTRODUCTION TO THE EJB 3 ARCHITECTURE Download GlassFish version 2, build 3 to the directory in which you want to install it. We have downloaded the JAR file into a directory named Software in the C: drive. Open a command prompt window and change directory to the location at which you have the downloaded GlassFish JAR file. jar Figure 1-2. Installing GlassFish This command will prompt for a license agreement dialog initially. Read the agreement, and scroll down and press the Accept button.