Or you might try to use it with JNA-Library:
   import com.sun.jna.platform.win32.Kernel32;
   import com.sun.jna.Native;
   import com.sun.jna.Library;
   interface JnaTests extends Library {
    public boolean Beep(int FREQUENCY , int DURATION );
    static Kernel32 kernel32 = (Kernel32) Native.loadLibrary("kernel32", Kernel32.class); 
   static void startBeep() throws InterruptedException { 
   kernel32.Beep(1200, (5000)); 
   Thread.sleep(50); 
  }
}
  package com.sun.jna.platform;
  import com.sun.jna.Library;
   public class win32 {
   private static class MSG implements User32 {
    public MSG() {
    }
   }
  public interface Kernel32 extends Library { // ... (lines deleted for   clarity) ...  
    boolean Beep(int frequency, int duration); 
     //int GetLogicalDrives(); // ... (lines deleted for clarity)   ...      }   
    }
   public interface User32 extends Library { // ... (lines deleted for  clarity) ...  
        // ... (lines deleted for clarity) ... }
   }
  }
  Perhaps you could use the midi class too:
Sequencer sequencer = MidiSystem.getSequencer();
sequencer.open();
Sequence sequence = new Sequence(Sequence.PPQ,4);
Track track = sequence.createTrack();
ShortMessage a = new ShortMessage();
a.setMessage(144,9,56,100);
MidiEvent event = new MidiEvent(a, 1);
track.add(event);
sequencer.setSequence(sequence);
sequencer.start();
Thread.sleep(500);
sequencer.close();