Java Message Service (JMS) provides a way for the components of a distributed application to talk asynchronously, or for welding together legacy enterprise systems. Unlike COM, JMS uses one or more servers to handle JMS messages in store-and-forward, so losing one or more components does not bring the whole distributed application to quit. JMS consists of a set of messaging APIs that enable two types of messages, publish-and-subscribe (one-into-many), and point to point (one-into-one). You need the background. After a simple JMS demonstration in which you create a chat application using both types of messages, the authors dissect JMS message structures, explore both types in detail, and then move to consideration of the real world. List of attachments and describe the JMS API, and provides reference materials messages. Given the complexity and range of subject matter, Java Message Service does a great job covering the theory and practice in a surprisingly efficient.