I just committed a change to org.jboss.ha.framework.interfaces.ClusterNode in trunk that results in IncompatibleClassChangeError if you try to run the AS without doing a "build clean" and "build" first. So, if you update AS trunk, do a clean and rebuild. -- Brian Stansberry Lead, AS Clustering JBoss, a division of Red Hat brian.stansberry(a)redhat.com