The Apache ActiveMQ message broker is an open source implementation of the Java Message Service spec. It makes for a reliable hub in any message-oriented enterprise application and integrates beautifully with Java EE containers, ESBs, and other JMS providers.
ActiveMQ in Action is all you'll need more » to master ActiveMQ. It starts from the anatomy of a JMS message and moves quickly through connectors, message persistence, authentication, and authorization. By following a running example (a stock portfolio app), you'll pick up the best practices distilled by the authors from their long and deep involvement with this technology. « less