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IBM is exploiting Enterprise JavaBeans™ in a family of compatible Java™ application servers conforming to IBM's Enterprise Server for Java (ESJ) specification. The ESJ provides a common set of dynamic, adaptive system services to meet today's (and tomorrow's) middleware requirements. ESJ will provide a standard programming model and set of services across major server platforms so that implementations of ESJ are differentiated not by function but by quality of service. Finally, ESJ increases productivity by enabling programmers to focus on business logic rather than on infrastructure details. This paper introduces the design of ESJ, including the attributes of the common execution environment, its interaction with other middleware, and its client/server capabilities. It provides an appreciation of the value of ESJ to application developers as a means of achieving cross-platform consistency, lower costs, and faster time to market. It also outlines the features that make ESJ the server technology base for wide-scale reuse through the “write once, run anywhere” promise of Java.
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