From: <glassfish_at_javadesktop.org>
Date: Sun, 12 Oct 2008 21:09:24 PDT

as explained above in the thread, if you have changed any of jdbc-driver property, you need to restart appserver / reploy referring application.

http://docs.sun.com/app/docs/doc/819-3671/ablch?a=view
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http://forums.java.net/jive/thread.jspa?messageID=305792