it's a good idea to place database driver jars inside the "lib" directory
(JBOSS_HOME/server//lib) b/c you're not going to hot-deploy those while the server is
up and running.
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if you deploy you entity beans and your mysql jar in the same directory called
deployDir (for example),
you must create a subdirectory called deployDir.last where you'll move your entity
beans ears.
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