The Java Message Service (JMS)
An enterprise-level platform such as J2EE wouldn't be complete without a messaging API. Thanks to the Java Message Service (JMS), J2EE has good support for messaging. JMS is similar to JDBC in that it is a standard API for existing message systems, just as JDBC is a standard API for accessing databases. Like JDBC, JMS can't stand on its own two feet. It only defines the interfaces and major classes that are used to communicate with a messaging system, and does not actually implement any messaging.
Most of the top J2EE application servers support messaging, so you shouldn't have too hard a time finding an implementation of the messaging service. Sun provides a list of JMS vendors at http://java.sun.com/products/jms/vendors.html ...
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