Pete, I tried your example posted here: http://jroller.com/pmuir/entry/using_sets_in_jsf. userGroup.xhtml now looks like this: | <h:selectManyListbox id="locationsListBox" value="#{dc:asList(userGroupHome.instance.locations)}" | disabled="#{not s:hasRole('admin')}"> | <s:convertEntity /> | <s:selectItems value="#{locationList.resultList}" var="location" | label="#{location.locationName}" noSelectionLabel="None" /> | </h:selectManyListbox> | where 'asList' is the function described in the link above. Now, when trying to create a userGroup I get: model validation failed:/members/userGroup.xhtml @33,44 value="#{dc:asList(userGroupHome.instance.locations)}": Illegal Syntax for Set Operation What am I missing? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4126464#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...