Object caching?

Hello, I found a strange behaviour. The following scenario: our production xwiki environment runs on jboss 4.0.2/MySQL 4.1. The development environment runs on my PC using jboss 4.0.3SP1/MySQL 5.0. When I create a dump from the database on my PC and restore this dump on the production database, I still don't see the new objects. This only happens when we do a full shutdown/restart of jboss. We also saw that the memory utilisation of XWiki went up the more pages are viewed. This makes me think there is a caching mechanism in place. That's fine, but can this be overruled? The Jboss production machine runs other applications as well, and I don't want to fully restart the server. Thanks, Joep Janssen