Prosty odtwarzacz video w java

Buduję prosty program do odtwarzania filmów w java.
Znalazłem taki przykład i coś z nim jest nie tak, czy mógłby mi ktoś podpowiedzieć gdzie jest błąd?

package SimpleVideoPlayerWithJava;

import java.awt.BorderLayout;
import java.awt.Component;
import java.net.MalformedURLException;
import java.net.URL;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.swing.JFileChooser;
import javax.swing.JFrame;

public class SimpleVideoPlayerWithJava extends javax.swing.JPanel {

    public SimpleVideoPlayerWithJava(URL mediauUrl) {
        initComponents();
        setLayout(new BorderLayout());
        try {
            Player mediaPlayer = Manager.createRealizedPlayer(new MediaLocator(mediauUrl));
            Component video = mediaPlayer.getVisualComponent();
            Component control = mediaPlayer.getControlPanelComponent();
            if (video != null) {
                add(video, BorderLayout.CENTER);          // place the video component in the panel
            }
            add(control, BorderLayout.SOUTH);            // place the control in  panel
            mediaPlayer.start();
        } catch (Exception e) {
        }
    }

    private void initComponents() {

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getTopLevelAncestor());
        layout.setHorizontalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 720, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGap(0, 480, Short.MAX_VALUE)
        );
    }

    public static void main(String[] args) {

        JFileChooser fileChooser = new JFileChooser();
        fileChooser.showOpenDialog(null);

        URL mediaUrl = null;
        try {
            mediaUrl = fileChooser.getSelectedFile().toURI().toURL();
        } catch (MalformedURLException ex) {
            System.out.println(ex);
        }

        JFrame mediaTest = new JFrame("Movie Player");
        mediaTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        SimpleVideoPlayerWithJava mediaPanel = new SimpleVideoPlayerWithJava(mediaUrl);
        mediaTest.add(mediaPanel);
        mediaTest.setSize(800, 700); // set the size of the player
        mediaTest.setLocationRelativeTo(null);
        mediaTest.setVisible(true);

    }
}

wyskakuje taki błąd:

Exception in thread "main" java.lang.IllegalArgumentException: Container must be non-null
at javax.swing.GroupLayout.<init>(GroupLayout.java:374)
at SimpleVideoPlayerWithJava.SimpleVideoPlayerWithJava.initComponents(SimpleVideoPlayerWithJava.java:48)
at SimpleVideoPlayerWithJava.SimpleVideoPlayerWithJava.<init>(SimpleVideoPlayerWithJava.java:17)
at SimpleVideoPlayerWithJava.SimpleVideoPlayerWithJava.main(SimpleVideoPlayerWithJava.java:112)
C:\Users\Tomas\AppData\Local\NetBeans\Cache\8.1\executor-snippets\run.xml Java returned: 1
BUILD FAILED (total time: 6 seconds)