If I use seperate classloaders for the sar I get the following: | Caused by: javax.management.InvalidAttributeValueException: Set attribute has class class $Proxy141 loaded from org.jboss.mx.util.MBeanProxyExt$2@fc9074 that is not assignable to attribute class interface org.jboss.portal.core.event.PortalEventListenerRegistry loaded from org.jboss.mx.loading.UnifiedClassLoader3@fac2be{ url=file:/home/jboss/jbossas/jboss-4.0.3SP1/server/uat/tmp/deploy/tmp60673RSBArea6.sar ,addedOrder=95} | at org.jboss.mx.interceptor.ModelMBeanAttributeInterceptor.checkAssignable(ModelMBeanAttributeInterceptor.java:214) | at org.jboss.mx.interceptor.ModelMBeanAttributeInterceptor.invoke(ModelMBeanAttributeInterceptor.java:73) | at org.jboss.mx.interceptor.PersistenceInterceptor.invoke(PersistenceInterceptor.java:61) | at org.jboss.mx.server.Invocation.invoke(Invocation.java:74) | at org.jboss.mx.server.AbstractMBeanInvoker.setAttribute(AbstractMBeanInvoker.java:442) | at org.jboss.mx.server.MBeanServerImpl.setAttribute(MBeanServerImpl.java:593) | at org.jboss.system.ServiceConfigurator.setAttribute(ServiceConfigurator.java:665) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4020130#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...