Debugging XWiki

Hello Vincent and everyone at XWiki! I am going through the code but I need to view how XWiki is generating SQL queries that are sent to the JDBC driver in order to see if it's XWiki that has a problem or Hibernate or the JDBC driver. Yes, I am working with Fabian and them to try and figure out why Postgres gives a problem when porting from an old DB. Could you guys maybe give me instructions of how to turn on debug mode. Thanks alot. Regards, Dandre