thanks guys for pointing solution. Exception is horrible unclear . Before Christmas vacation i had added jmx parameter to run.conf to monitor jboss. After vacation I did svn update and JBoss doesn't start. I forget about this parameter added 2 weeks ago. I thought it is from updating svn repo but it was my mistake. Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4199595#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...