code: public void applyFeatureTransaction(FeatureTransaction ft) {
  		if (ft != null) {
  			VectorLayer layer = ft.getLayer();
  			if (layer != null) {
  				// clear all the tiles
  				layer.getFeatureStore().clear();
  			}
  			// now update/add the features
  			if (ft.getNewFeatures() != null) {
  				for (Feature feature : ft.getNewFeatures()) {
  					ft.getLayer().getFeatureStore().addFeature(feature);
  				}
  			}
  			// make it fetch the tiles
  			mapView.translate(0, 0);
  			handlerManager.fireEvent(new FeatureTransactionEvent(ft));
  		}
  	}
docs: Apply a certain feature transaction onto the client side map model. This method is usually called after that same
  feature transaction has been successfully applied on the server.
  
  @param ft
  The feature transaction to apply. It can create, update or delete features.