Composite component support for EJB

Authors:
Steffen Goebel;Michael Nestler
Affiliations:
Dresden University of Technology, Dresden, Germany;Dresden University of Technology, Dresden, Germany
Venue:
WISICT '04 Proceedings of the winter international synposium on Information and communication technologies
Year:
2004

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Abstract

Component frameworks and component middleware like Enterprise JavaBeans (EJB) have been established successfully in the last few years. However, composite components are not yet a part of these platforms. They increase reuse of software and can be used to encapsulate run-time adaptation. We present a composite component framework developed as an extension of EJB 2.0. We describe general design objectives for composite components and required rules for the visibility of components. The necessary container support for composite EJBs is implemented based on the EJB application server JBoss. An example application demonstrates the use of the new EJB type and shows how to dynamically reconfigure graphs of composite EJB components after their deployment in order to achieve run-time adaptivity.