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Enterprise JavaBeans (EJB) defines a server-side component model that allows
business objects to be developed and moved from one brand of EJB container to
another. A component (an enterprise bean) presents a simple programming model
that allows the developer to focus on its business purpose. An EJB server is
responsible for making the component a distributed object and for managing
services such as transactions, persistence, concurrency, and security. In
addition to defining the bean’s business logic, the developer defines the bean’s
runtime attributes in a way that is similar to choosing the display properties of
visual widgets. The transactional, persis tence, and security behaviors of a
component can be defined by choosing from a list of properties. The end result is
Copyright (c) 2001 O'Reilly & Associates 3
that Enterprise JavaBeans makes developing distributed component systems that
are managed in a robust transactional environment much easier. For developers
and corporate IT shops that have struggled with the complexities of delivering
mission-critical, high-performance distributed systems using CORBA, DCOM, or
Java RMI, Enterprise JavaBeans provides a far simpler and more productive
platform on which to base development efforts.
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