Is there a difference when using of message servers?

Pardon my ignorance�..
I am kind of new to Java. I am suppose to write a JMS chat application but I am not particularly sure as to the use of message server( SwiftMQ, JMQ,j2ee server etc). When writing my program, what are the differences in the code when using different message server. It seem that the JMS example�uses j2ee server. Is there are differences in the code when I am using a different message server..
To phrase it in another way, when writing my JMS chat application, do I need to make any modification in order to running any other message server.
Could someone enlighten me.
Regard
AG

The J2EE server is the Reference Implementation of the J2EE 1.3 specification. It include the JMS Reference Implementation . Reference Implementations are designed to validate and demonstrate all of the required features of specifications. Generally speaking, they are not designed to be used in a high volume production environment. They may not have all the performance characteristics that a commercial implemenation might have.
Commercial implemenations of JMS, such as JMQ from I-Planet, are designed for high volume, fast throughput situations. There are a number of these implementations. See http://java.sun.com/products/jms/licensees.html and the links from there for more details.
So it depends on your need: If you want to do some proof of concept work, the J2EE RI is would be a good place to start. If you need a production quality implementation, you may want to select one of the commercial implementations. However, if you start with one, and want to move to another, this should be fine, as the JMS APIs support code portability.

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