problem with database and hibernate

I'm trying to save a field in the database.
this field is an object and I'm doing all this using hibernate.
My question is how can I pass the object if I select another data grid using the form shown in the showcase EE or otherwise exite


usersListGrid.addSelectionChangedHandler (new SelectionChangedHandler () {
public void OnSelectionChanged (SelectionEvent event) {
editForm.setValue ("user", event.getRecord ());
editForm.saveData ();

}
});
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