1) Use sticky sessions. If you don't you are asking for trouble. 2) If you disregard #1, there shouldn't be any harm in leaving UseJK=false. The purpose of the JvmRouteValve is to allow the session to stay stuck after failover. 3) I've never tried to use mod_jk without configuring a jvmRoute. Quite possibly it will work fine. Suggest you just try it and see. Hmm, come to think of it just yesterday I by accident tried mod_jk w/ no jvmRoute configured (forgot to configure it on a test setup.) It seemed to work fine except the sessions didn't stick, which is to be expected. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4242475#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...