anonymous wrote : Just to note, when i try to invoke the metod (in both cases), I always do it from the same pc server the jboss is running but I always lookup the remote interface. Maybe your 4.0.5GA server is treating the call to the remote method as local and not serializing the parameters. Check what's the value for CallByValue in conf/jboss-service.xml file for your 4.0.5GA instance and compare it with your 4.0.3 instance. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4114889#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...