MidiUnavailableException question

Hi:
    The following code complies but at runntime I get the following error:

javax.sound.midi.MidiUnavailableException: Audio Device Unavailable
at com.sun.media.sound.HeadspaceMixer.open(HeadspaceMixer.java:628)
at com.sun.media.sound.AbstractPlayer.open(AbstractPlayer.java:138)
at MiniMusicPlayer1.main(MiniMusicPlayer1.java:11)

Can someone tell me why I get this error and how can I fix it?

import javax.sound.midi.*;

public class MiniMusicPlayer1
{  public static void main(String[] args)
   {
   
   try
     {  
      Sequencer sequencer = MidiSystem.getSequencer();
      sequencer.open();
     
      Sequence seq = new Sequence(Sequence.PPQ, 4);
      Track track = seq.createTrack();
     
      for (int i = 5; i < 61; i+=4)
      {
         track.add(makeEvent(144,1,i,100,i));
         track.add(makeEvent(128,1,i,100,i + 2));
      }
     
      sequencer.setSequence(seq);
      sequencer.setTempoInBPM(220);
      sequencer.start();
      }
      catch (Exception ex)
      {
         ex.printStackTrace();
      }    
   
 }  
   public static MidiEvent makeEvent(int comd, int chan, int one, int two, int tick)
   {  MidiEvent event = null;
      try
      {  ShortMessage a = new ShortMessage();
         a.setMessage(comd, chan, one, two);
         event = new MidiEvent(a, tick);
      }
     
      catch(Exception e){}
     
         return event;
         
      }
     
   }                  
     
LearningJavaAsked:
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objectsConnect With a Mentor Commented:
Make sure the device is present, and check that no other application is using it.
0
 
objectsCommented:
Cause the Sequencer is not available :)

If it does exist and is configured correctly perhaps another application is already using it.
0
 
LearningJavaAuthor Commented:
How do I troubleshoot this problem?
0
 
objectsCommented:
0
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