By Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,
Firm JavaBeans 3.0 (EJB 3.0) is a crucial element of 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 enterprise functions akin to transaction-based purposes. Ever in view that its first unlock, EJB has been the topic of a lot media awareness and no little controversy. EJBs characterize a worldly and strong expertise and EJB-based functions can aid excessive numbers of transactions and clients, with greatest defense. even if, earlier incarnations of EJB have emerge as appeared via many as an excessively complicated expertise which may result in high priced and time-consuming ideas 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 greatly simplified programming version has been generally acclaimed and embraced. starting EJB three takes the reader during the info of the EJB 3.0 structure, and exhibits how EJB can be utilized to advance robust, standards-based backend enterprise common sense. With 12 years of mixed EJB adventure, the authors supply many useful insights into the whole EJB structure, masking all components of the EJB 3.0 specification, together with its new endurance framework, simplified improvement version, and different key new good points.
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Additional info for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
The provider may define mapping and primary key–generation behavior, but this role is generally limited to defining the logical dependencies and structure of the entity. The Application Assembler The Application Assembler combines EJBs into EJB modules and entities into persistence archives, and then combines these modules together with other Java EE modules to produce an application. This task requires resolving references between enterprise beans and entities. The Application Assembler must work with the interfaces and metadata defined for the EJB and entity components, but needs not be familiar with the implementation details.
Figure 1-5. qxd 8/31/06 6:44 PM Page 19 CHAPTER 1 ■ INTRODUCTION TO THE EJB 3 ARCHITECTURE Click the New button at the bottom of the User Variables section, and the New User Variable dialog will appear. Enter JAVA_HOME in the Variable name field and C:\software\ jdk15 in the Variable value field, as shown in Figure 1-6. Click the OK button. ■Note Substitute the directory in which you have installed J2SE for C:\software\jdk15. Figure 1-6. The New User Variable dialog Similar to the preceding step, add two more environment variables, GLASSFISH_HOME and ANT_HOME.
Examples of the three supported inheritance mapping strategies identify the strengths and weaknesses of each approach, to help you decide which one best suits the particular needs of your application. This chapter also covers the ID (primary key) generators introduced in the JPA, for autopopulating ID values using a database sequence or table. Chapter 5: EJB 3 Message-Driven Beans This chapter describes how you can use MDBs to add asynchronous, event-driven behavior to your application. JMS, Java’s messaging API, is explained and demonstrated in this chapter’s code examples.