This might be a stupid question, but how did you install Application Server to Mac OS in the first place since there is no separate Application Server download for this platform? Was it installed as part of NetBeans or Creator IDE? In that case your best bet to get clean system is to uninstall/reinstall using IDE installer/uninstaller.
Another thing you can try is uninstalling by invoking java appserv_uninstall (appserv_uninstall.class file should be in appserver's installation directory).