From: <glassfish_at_javadesktop.org>
Date: Fri, 20 Aug 2010 06:25:08 PDT

I solved it,

i had to setup a connection to the mysql server in the glassfish administration
and to add the mysql-connection driver to the classpath of the vm..
[Message sent by forum member 'tallan']

http://forums.java.net/jive/thread.jspa?messageID=480676