Why is this in the clustering forum? Caused by: java.lang.NoClassDefFoundError: edu/emory/mathcs/backport/java/util/concurrent/ConcurrentHashMap The jar with the JDK 1.4 backport of the java.util.concurrent package is not available on the classpath. Perhaps that's due to the whatever the problem is deploying the shared library. That ERROR logging there is useless; no way someone unfamiliar with service-mix details could help. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127050#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...