In making a call to an MBean, I get this exception, I'm using SP1 as the server and GA as the client system. This potentially is a big problem but I'd like to confirm that this shouldn't be done due to changes to the EJB spec. 11:49:26,465 ERROR [STDERR] javax.naming.CommunicationException [Root exception is java.io.InvalidClassException: org.jboss.ejb3.remoting.IsLocalInterceptor; local class incompatible: stream classdesc serialVersionUID = 595045557897063404, local class serialVersionUID = -3758782076801249473] Here are a few search results that I found online, http://jira.jboss.com/jira/browse/EJBTHREE-402 http://jira.jboss.com/jira/browse/EJBTHREE-749 More insight into this issue would help. Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4043729#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...