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When two objects communicate, often one object is sending a command to the other object to perform a particular function. The most common way to accomplish this is for the first object (the "issuer") to hold a reference to the second (the "recipient").
This is a simple example of how to use messaging, implemented in JMS [JMS]. It shows how to implement Request-Reply, where a requestor application sends a request, a replier application receives the request and returns a reply, and the requestor receives