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Sams Teach Yourself J2EE™ in 21 Days by Peter Roxburgh, Andy Longshaw, Debbie Law, Dan Haywood, Martin Bond

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Messaging

Many enterprise applications are built from separate software components. These components can reside on the same system or in a distributed or multi-tiered environment on several Java Virtual Machines.

Some method of communication is almost always required between the components in large systems. It is often a requirement that this communication should also be loosely coupled or asynchronous. In asynchronous communication, the sender sends the message and continues execution without waiting for a reply, and the receiver can retrieve the message at any time after it has been sent. In a loosely coupled system, the sender does not need to necessarily know who the recipient is; the communication itself may or may not be asynchronous. This ...

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