Hello,
i'm implementing hibernate 3 and i don't know the advantadges and problems of using Datasources or DriverManager for the connection.

If somebody could give a clue of which one is better..
Thanks in advance !

A datasource is really a connection pool. It helps manage a number of connections, and can help spread out use over multiple clients.

When you're talking DriverManager, you're probably talking about creating a direct connection per request. That's pretty resource intensive, and a waste of critical resources.

Use a datasource!