Related to JBAS-6242, a general problem for the jon usage of managed objects is that they need more information about operation return types when they are opaque types like Object mapping to anything from a GenericValue to a String. For operations that do have a fixed type the return type should be mapped to that. For operations that can change based on other settings as is the case for the JBAS-6242, I guess we have to impose a fixed type that a MetaMapper will have to handle producing based on the possible return types. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4236776#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...