I know that this post is pretty old but I came across the same problem and was able to get past it. posting it here (also to get a feedback just in case there is a problem with the approach) Here is what I did create a mycache.sar with jbosscache-core.jar, jboss-common-core.jar and jgroups.jar (from the 2.1.1 release and in jboss-service.xml added the following lines along with the mbean element of cache, for scoped deployment (to avoid interfering with the jboss cache 1.4.x version shipped with 4.2.2 GA) <loader-repository> com.my:registry=mycache <loader-repository-config>java2ParentDelegation=false</loader-repository-config> </loader-repository> Regards Monmohan View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4196034#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...