Your Schema was wrong. You had an infinite number of wildcards in an infinite number of choices. This is a bug in JBossXB since this should create a list of wildcards instead it tries to set the second wildcard in the first wildcard. There is an open bug report/test case about this. I removed the unbounded from the xsd:any and now it works properly. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4009588#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...