On Aug 2, 2011, at 10:36 PM, Dale Amon wrote:
  On Tue, Aug 02, 2011 at 10:22:10PM +0200, Guillaume
Fenollar wrote:
  If you are talking about the default database,
then it's HSQLDB. You can
 compare the two methods (hsqldb vs mysql) to make your own opinion, but I
 advise you to use mysql for production environment.
 If you choose to use mysql, don't forget to download the mysql-java
 connector and to move it into WEB-INF/lib directory in xwiki. 
 type Exception report 
[snip]
  Wrapped Exception: Could not create a DBCP pool. There
is an error in the hibernate configuration file, please review it. 
This means your hibernate.cfg.xml file is not correctly configured.
[snip]
Thanks
-Vincent