[xwiki-users] xwiki.cfg seems not to be applied?

Hello list, In /etc/xwiki/xwiki.cfg I modified * xwiki.defaultWeb * xwiki.defaultPage * and xwiki.showviewaction, but none of them has been applied after I restarted tomcat? Anyone else got similar issues on Ubuntu (12.04 LTS)? Do I have to trigger something else to apply it? Best regards Florian