Well, I'm having precisely the same problem. I was browsing through forums to find a solution to that with no success. In this post: http://www.jboss.com/index.html?module=bb&op=viewtopic&t=98856 there is a suggestion of work around (constructing tree via facelets method call and returning plain list of objects from session bean) but it didn't work for me. In another post (http://www.mail-archive.com/adffaces-user@incubator.apache.org/msg01321.html) I read a suggestion that this may be a class loader issue but again equipped with this knowledge I was no able to get it right. Finally I've taken a registration-trinidad example from Seam wiki page (http://www.jboss.com/wiki/Wiki.jsp?page=JBossSeam) and added a simple tree to it - the same issue. I'm really stucked on this one. Any help greatly appreciated (any chances for some more involved example of Seam + Trinidad?). Cheers, Adam View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4008050#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...