Exception in thread "AWT-EventQueue-0" java

[Asma'a]

import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.net.MalformedURLException;
import java.util.logging.*;
import javax.sound.sampled.*;
import javax.swing.*;



public class BounceyDot {
  public static float SAMPLE_RATE = 8000f;
 public static void tone(int hz, int msecs) 
            throws LineUnavailableException 
                    {
                       tone(hz, msecs, 1.0);
                    }
 
  public static void tone(int hz, int msecs, double vol)
      throws LineUnavailableException 
  {
                byte[] buf = new byte[1];
                AudioFormat af = 
                    new AudioFormat(
                        SAMPLE_RATE, // sampleRate
                        8,           // sampleSizeInBits
                        1,           // channels
                        true,        // signed
                        false);      // bigEndian
                SourceDataLine sdl = AudioSystem.getSourceDataLine(af);
                sdl.open(af);
                sdl.start();
                for (int i=0; i < msecs*8; i++) {
                  double angle = i / (SAMPLE_RATE / hz) * 2.0 * Math.PI;
                  buf[0] = (byte)(Math.sin(angle) * 127.0 * vol);
                  sdl.write(buf,0,1);
                }
                sdl.drain();
                sdl.stop();
                sdl.close();
  }
    public static void main(String[] args)
           {
              new BounceyDot();
            }

    public BounceyDot() {
        EventQueue.invokeLater(new Runnable() {
         @Override
          public void run() {
            try {
                  UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } 
            catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                 SoundUtils.tone(1000,100);
             try {
                 Thread.sleep(1000);
             } catch (InterruptedException ex) {
                 Logger.getLogger(BounceyDot.class.getName()).log(Level.SEVERE, null, ex);
             }
    SoundUtils.tone(100,1000);
             try {
                 Thread.sleep(1000);
             } catch (InterruptedException ex) {
                 Logger.getLogger(BounceyDot.class.getName()).log(Level.SEVERE, null, ex);
             }
    SoundUtils.tone(5000,100);
             try {
                 Thread.sleep(1000);
             } catch (Exception ex) {
                 System.out.println(ex.getMessage());
             }
    SoundUtils.tone(400,500);
             try {
                 Thread.sleep(1000);
             } catch (Exception ex) {
                 System.out.println(ex.getMessage());
             }
    SoundUtils.tone(400,500, 0.2);

                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private int x = 0;
        private int y = 100;
        private int radius = 20;
        private int xDelta = 2;

        public TestPane() {
            Timer timer = new Timer(40, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    x += xDelta;
                          if (x + (radius * 2) > getWidth()) {
                        x = getWidth() - (radius * 2);
                        xDelta *= -1;
                    } else if (x < 0) {
                        x = 0;
                        xDelta *= -1;
                    }
                    repaint();
                }
            });
            timer.start();
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(200, 200);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            g.setColor(Color.RED);
            g.fillOval(x, y - radius, radius * 2, radius * 2);
        }
    }

}

السلام عليكم هنا عملت كود الصوت مع الأشكال ..لمن كل كود منفصل لحالة يعمل بشكل صحيح لكن لمن أدمج الكودين ينتج خطأ لم أستطيع تصحيحة..فممكن مساعدة؟