1. menuItem.setGraphic(new ImageView("path to image"));

there is no such ImageView constructor, shoud be: menuItem.setGraphic(new ImageView(new Image("path to image")));

2. two typos in

final Menu menu1 = new Menu("File");
menu.getitems().add(menuItem);

should be

final Menu menu = new Menu("File");
menu.getItems().add(menuItem);