Has anyone solved this? I deployed my seam 1.0.1.GA app to jboss/all and I get the same error. In my web.xml I had added: <distributable/> In my jboss-web.xml I had added: <replication-config> | <replication-trigger>SET_AND_NON_PRIMITIVE_GET</replication-trigger> | <replication-granularity>SESSION</replication-granularity> | </replication-config> | When I back these changes out the error goes away, but obviously this is not what I want to do. Also, all my SLSBs & SFSBs are marked as @Clustered and the SFSBs are Serializable. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977086#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...