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Enterprise JavaBeans
Enterprise JavaBeans (EJB) is a managed, server software for modular construction of enterprise software, and one of several Java APIs. EJB is a server-side software component that encapsulates the business logic of an application. The EJB specification is a subset of the Java EE specification. An EJB web container provides a runtime environment for web related software components, including computer security, Java servlet lifecycle management, transaction processing, and other web services.
== Specification ==
The EJB specification was originally developed in 1997 by IBM and later adopted by Sun Microsystems (EJB 1.0 and 1.1) in 1999〔''J2EE Design and Development'', © 2002 Wrox Press Ltd., p. 5.〕 and enhanced under the Java Community Process as (JSR 19 ) (EJB 2.0), (JSR 153 ) (EJB 2.1), (JSR 220 ) (EJB 3.0), (JSR 318 ) (EJB 3.1) and (JSR 345 ) (EJB 3.2).
The EJB specification intends to provide a standard way to implement the server-side (also called "back-end") 'business' software typically found in enterprise applications (as opposed to 'front-end' user interface software). Such machine code addresses the same types of problems, and solutions to these problems are often repeatedly re-implemented by programmers. Enterprise JavaBeans is intended to handle such common concerns as persistence, transactional integrity, and security in a standard way, leaving programmers free to concentrate on the particular parts of the enterprise software at hand.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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