Enterprise JavaBeans (EJB) is a managed, server-side component architecture for modular construction of enterprise applications.
The EJB specification is one of several Java APIs in the Java EE specification. EJB is a server-side model that encapsulates the business logic of an application. The EJB specification was originally developed in 1997 by IBM and later adopted by Sun Microsystems (EJB 1.0 and 1.1) in 1999 and enhanced under the Java Community Process as JSR 19 (EJB 2.0), JSR 153 (EJB 2.1), JSR 220 (EJB 3.0) and JSR 318 (EJB 3.1).
The EJB specification intends to provide a standard way to implement the back-end 'business' code typically found in enterprise applications (as opposed to 'front-end' interface code). Such code addresses the same types of problems, and solutions to these problems are often repeatedly re-implemented by programmers. Enterprise JavaBeans are intended to handle such common concerns as persistence, transactional integrity, and security in a standard way, leaving programmers free to concentrate on the particular problem at hand.
To deploy and run EJB beans, a Java EE Application server can be used, as these include an EJB container by default. Alternatively, a standalone container such as OpenEJB can be used.
Read more about Enterprise JavaBeans: General Responsibilities, Rapid Adoption Followed By Criticism, Reinventing EJBs, Example, Types of Enterprise Beans, Execution, Container Variations
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