Does it has a default zero argument constructor? Double check here if everything is met http://code.google.com/intl/it-IT/webtoolkit/doc/trunk/DevGuideServerCommunication.html#DevGuideSerializableTypes
-- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.