☆ A middle ware from IBM.

☆ It has runtime managers such as Queue Managers and Queues.

☆ Queue is an object which holds messages of various formats - XML/text/byte.

☆ Queue manger maintains and manages objects like Queues, channels.

☆ Various listener applications listen to these queues for grabbing the messages, followed by processing these messages.

☆ Java Messaging Service is one of the standards provided by JEE specification for asynchronous messaging.

☆ The queues can be defined in JEE container and send messages on these queues.

☆ Message Driven Bean can be configured for listening the JMS queues.

☆ When a message is on the JMS queue, the corresponding MDB's onMessage() method is invoked and the message processing can be done.