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.