at first, i'm not native english speaker.
let's see follow code.
in this case, behavior map's saveState result is not null. because AjaxHandler.AjaxBehaviorListenerImpl didnt implement PartialStateHolder, instead at implemented StateHolder.
since making new listener instance at every view re-building can be expensive, so is this better good?
nor just mistake?
thanks for reading. have a nice day.