Running this script

import javafx.stage.Stage;
import javafx.scene.Scene;

import javafx.scene.effect.Lighting;
import javafx.scene.shape.Rectangle;

/**
 * @author whp
 */

Stage {
    title: "Application title"
    width: 250
    height: 80
    scene: Scene {
        content: [
            Rectangle {
                x: 10
                y: 10
                width: 230
                height: 60
                effect: Lighting { diffuseConstant: 0.7}
            }

        ]
    }
}

Crashes jvm with