StateFul delegation of dataobjects with Activewidgets

I have been looking around a solution where the state of javascript objects are mapped to objects on server.

This is similar like JSF and GWt2.4. In fact GWT2.4 request factory model with editor drivers serves the purpose very well. The state of classes under client package though execute on server but generate a JSON output that executes on cleint browser.

Have you ever been able to put in a solution similar to what that has been achieved in GWT 2.4