I just upgraded my test server to 6.0 and ran into some troubles that maybe others would appreciate hearing about. First there was the mysql root password issue as reported at http://jira.xwiki.org/browse/XE-1396 Xwiki still wouldn't start after the upgrade and /var/log/tomcat7/localhost.log said "SEVERE: Error configuring application listener of class org.xwiki ... Unsupported major.minor version 51.0" Turns out my server had java6 AND java7 installed and I think tomcat was picking up 6 which no longer works for Xwiki 6.0. So I opened up /etc/default/tomcat7 and set the JAVA_HOME var to the java7 folder and now xwiki works again. Hope that helps someone out there... :)