"Organizations are increasingly demanding applications where communication between software components is loosely coupled and often asynchronous. In asynchronous communication, an application sends a message, and then continues program execution without waiting for a response. In a loosely coupled system, the sending program might not even know where or what the recipient is, because the communication between software components takes place via messaging. The Java Messaging Service (JMS) is the only messaging API supported by J2EE.
"OpenJMS, a SourceForge project, is a free open source implementation of Sun Microsystems' JMS API 1.0.2 specification. In this article you'll see how to install and use OpenJMS, along with code samples that illustrate the point-to-point and publish/subscribe messaging models it supports..."
