Run the following snippet:
    @Override
    public void start(Stage stage) throws Exception {
        final Text text = new Text("Hello World");
        System.out.println(text.getFont()); //Prints System Regular 13
        text.setFont(new Font("Helvetica", 16));
        System.out.println(text.getFont()); //Prints Helvetica 16
        text.setStyle("-fx-font: 24pt serif;");
        System.out.println(text.getFont());//Prints Helvetica 16
        text.setFont(new Font("Monaco", 36));
        System.out.println(text.getFont());//Prints Monaco 36
        Platform.runLater(new Runnable() {
            public void run() {
                System.out.println(text.getFont());//Prints Serif 24, should be Monaco
            }
        });

        VBox box = new VBox();
        box.getChildren().add(text);
        Scene scene = newa Scene(box, 300, 300);
        stage.setTitle("My JavaFX Application");
        stage.setScene(scene);
        stage.show();
    }