按钮OnAction

Question

我在JavaFX应用程序上收到以下错误：

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException 
at restaurant.RestaurantListCell$1.handle(RestaurantListCell.java:123)
at restaurant.RestaurantListCell$1.handle(RestaurantListCell.java:1)

导致此错误的方法是以下方法：

    @Override
    public void updateItem(Restaurant item, boolean empty) {
        super.updateItem(item, empty);
        if (empty || item == null)
            setGraphic(null);
        else {
            open = new Button();
            address.setWrappingWidth(250);
            open.setOnAction(new EventHandler<ActionEvent>() {
                @Override
                public void handle(ActionEvent event) {
                    Parent pane = null;
                    try {
                        FXMLLoader loader = new FXMLLoader(getClass().getResource("../detail/RestaurantDetail.fxml"));
                        DetailController restaurantView = loader.getController();
                        restaurantView.changeInfo(item);
                        pane = loader.load();
                    } catch (IOException e) {

                    }
                    Scene table = new Scene(pane);
                    Stage x = new Stage();
                    x.setScene(table);
                    x.show();
                }
            });
            setGraphic(box);
        }
    }

}

专门导致它的行是restaurantView.changeInfo（item）。我曾尝试在上方硬编码另一家餐厅，并将其传递给changeInfo（）方法，但是它不起作用。任何帮助，将不胜感激。谢谢！