@Override
        public void onMouseClicked(MouseEvent e) {
          Point pt = map.toMapPoint(e.getX(), e.getY());

          Geometry buffer =
              GeometryEngine.buffer(
                  pt, map.getSpatialReference(), 200000, map.getSpatialReference().getUnit());

          Graphic g = new Graphic(buffer, bufferSymbol);
          graphicsLayer.addGraphic(g);
        }