right...Just to summarize your post, you want to press ctl+c but you accidently press ctrl+z? If so, you can get jboss back (presumable) by typing something like 'fg 1' as you ctrl+z will put process in background and fg 1 will bring it back.
If you do need to kill jboss, don't kill all java, look for the first thread with something like
in it and kill that.
thanks your help, it works:)