I do not see anything obviously wrong. The JDK 6 issue typically will not show up until you start using web services. Usually, when others have gotten the "Trying to install an already registered mbean" there is something wrong with the installation of JBossAS, but the problem was most often solved by downloading the ZIP file and installing it again. I assume that your account has full access rights to the /datacommon/java/jboss-4.2.3.GA directory. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172921#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...