I think it's this bit from jboss-web-cluster.sar/jboss-web-cluster.aop/META-INF/jboss-aop.xml that is causing you trouble: | <!-- Make any POJO with a JDK5 PojoCacheable annotation as a Subject/Observerable --> | <bind pointcut="set(* @org.jboss.cache.aop.annotation.PojoCacheable->*)"> | <interceptor class="org.jboss.aspects.patterns.observable.SubjectInterceptor"/> | </bind> | | <introduction class=&quot;(a)org.jboss.cache.aop.annotation.PojoCacheable&quot;&gt; | <mixin> | <interfaces>org.jboss.aspects.patterns.observable.Subject</interfaces> | <class>org.jboss.aspects.patterns.observable.SubjectImpl</class> | <construction>new org.jboss.aspects.patterns.observable.SubjectImpl(this)</construction> | </mixin> | </introduction> | The latter causes the AspectManager to insert a SubjectInterceptor when you deploy your class. But when you did your aopc, your jboss-aop.xml didn't include the "introduction" element. So your class doesn't implement the Subject interface and you get a CCE when the SubjectInterceptor gets invoked. Two possible solutions: 1) Add the "introduction" element above to your jboss-aop.xml and run aopc again. 2) If you don't use FIELD granularity web session replication, remove the jboss-web-cluster.sar/jboss-web-cluster.aop file. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127242#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...