I've seen problems with touch during the J1 demo. So I added the following debug code:

    private void debugTouch(Scene scene, Pane parent) {
        scene.addEventFilter(TouchEvent.ANY, event -> {
            parent.getChildren().removeAll(touchPoints);
            for (int i = 0; i < event.getTouchPoints().size(); i++) {
                TouchPoint tp = event.getTouchPoints().get(i);
                Circle c;
                if (touchPoints.size() > i) {
                    c = touchPoints.get(i);
                } else {
                    c = new Circle(25, Color.rgb(255, 0, 0, 0.5));
                    c.setMouseTransparent(true);
                    touchPoints.add(c);
                }
                parent.getChildren().add(c);
                Point2D p = parent.sceneToLocal(tp.getSceneX(), tp.getSceneY());
                c.setLayoutX(p.getX());
                c.setLayoutY(p.getY());
            }
        });
    }

It visualizes each touch event by rendering circles where the touch points are reported.

I've seen the following issues with this code:
1. Consider you're touching the screen with two fingers, for example coordinates of one point is ~100,100 and second point is ~200,200. While still touching around the same points some events are reported with one or another point to be either 100,200 or 200,100.

2. Sometimes when you release fingers, wait half a second and do a next touch, you'll get previous touch points reported. So for example after two finger zoom touch, you press a button, but the event reports you all three touch points. See the screenshot.