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JPA (hibernate provider), hosted in glassfish, does not fetch data

From: <glassfish_at_javadesktop.org>
Date: Mon, 25 Jan 2010 14:55:15 PST

I have set up a data source to a database on glassfish (version 2.1.1 and version 2.1) Ping to data source is successful from both servers. I run v2.1.1 on linux (database mysql 5.1) and v2,1 on windows vista (database sql server 2008). I use hibernate on both servers. My project does not fetch data from both servers but it does not throw any exception. I run my project on a third installation too. On the later installation I use glassfish v2u2 on windows XP. It connects to both mysql and sql server 2008. This installation does fetch data from both a mysql and a sql server 2008 database.

What goes wrong to the first two installations? If you have not the answer could you help me find out the problem?

Thank in advance.
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