Chapter 10. Messaging and message-driven EJBs
Overview
Message-driven EJBs are new in Version 2.0 of the EJB Specification. This chapter begins with a discussion of enterprise messaging in general, with a particular focus on the practical benefits of this technology. We then discuss the JMS specification and the general procedures for sending messages using the JMS API. This leads to a discussion of the problems of asynchronous communicaton in the EJB architecture, which is essentially a request-response system, and how the use of message-driven EJBs can help in development of asynchronous services. We then discuss the development and use of message-driven EJBs themselves, illustrated by examples from the Prestige Bike Hire application.
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