Snippet:
public void start(Stage stage) throws Exception {
    String fontfile = "/Users/felipe/Documents/fonts/JandaElegantHandwriting.ttf";
    Font font = null;
    InputStream inputStream = null;
    try {
        FileInputStream fileStream = new FileInputStream(fontfile);
        inputStream = new BufferedInputStream(fileStream);
        inputStream.mark(1024*1024);
        font = Font.loadFont(inputStream, 48);
        inputStream.reset();
        //reuse the input stream
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (inputStream != null) {
            try {
                inputStream.close();
            } catch (IOException e) {}
        }
    }

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

In the J2D pipeline the call to inputStream.reset() will fail because the input stream is closed, this is an error since the javadoc for Font#loadFont(InputStream, double) explicitly says the stream will not be closed.