remove the following jar file from lib. server\default\lib\jboss-cache-jdk50.jar. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4182522#4182522 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4182522