OK, I'll use the proxy approach if the TypeInfo passed in for Composite is interface, otherwise I'll use the info to reconstruct the instance. But this means some details could get lost: | public class Pojo | ... | public class SubPojo extends Pojo | ... | MetaValue mv = MVF.create(new SubPojo(), Pojo.class); | SubPojo sp = MVF.unwrap(mv); // failed!! | I guess I could expand proxy usage to what I did with lazy stuff, to be able to handle classes as well for proxying: - http://anonsvn.jboss.org/repos/jbossas/projects/microcontainer/trunk/kern... But for Collections, you're saying there is nothing better than a default impl? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112269#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...