* @throws ExportException if the object cannot be exported
* @throws StubNotFoundException if the proxy class cannot be found
*/
protected Proxy doExportTo(Object object, URI uri)
throws ExportException, StubNotFoundException {
Proxy proxy = null;
ObjectRef ref = (ObjectRef) _objectMap.get(object);
if (ref != null) {
proxy = addProxyTo(ref, uri, object, ref.getProxyClass());
} else {
ObjID objID = new ObjID();