"alesj" wrote : OK, this is deeper problem, than I anticipated earlier. | | There is a problem of interfaces/abstract classes. You should just define default implementations for the collection interfaces like JAXB or JMX does. http://java.sun.com/javase/6/docs/api/javax/management/MXBean.html anonymous wrote : | A List is reconstructed as a java.util.ArrayList; a Set as a java.util.HashSet; a SortedSet as a java.util.TreeSet. | Generically, we could allow some kind of plugin mechanism to allow somebody to configure: interface -> implementation class or factory View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112235#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...