Getting error while running this code from Head First Java in Eclipse

[Somnath Rakshit]

I downloaded this code from Head First Java. But when I tried running it on Eclipse, it gives this error message. Please help.

import javax.sound.midi.*;


public class MiniMiniMusicApp {   // this is the first one
       
     public static void main(String[] args) {
        MiniMiniMusicApp mini = new MiniMiniMusicApp();
        mini.play();
     }

    public void play() 

      try {

         // make (and open) a sequencer, make a sequence and track

         Sequencer sequencer = MidiSystem.getSequencer();         
         sequencer.open();
        
         Sequence seq = new Sequence(Sequence.PPQ, 4);
         Track track = seq.createTrack();     

         // now make two midi events (containing a midi message)
         MidiEvent event = null;
         
         // first make the message
         // then stick the message into a midi event 
         // and add the event to the track

          ShortMessage a = new ShortMessage();
          a.setMessage(144, 1, 44, 100);
          MidiEvent noteOn = new MidiEvent(a, 1); // <-- means at tick one, the above event happens
          track.add(noteOn);

          ShortMessage b = new ShortMessage();
          b.setMessage(128, 1, 44, 100);
          MidiEvent noteOff = new MidiEvent(b, 16); // <-- means at tick one, the above event happens
          track.add(noteOff);
        
         // add the events to the track
            
          // add the sequence to the sequencer, set timing, and start
          sequencer.setSequence(seq);
         
          sequencer.start();
          // new
          Thread.sleep(1000);
          sequencer.close();
          System.exit(0);
      } catch (Exception ex) {ex.printStackTrace();}
  } // close play

} // close class

and this was the error message: Jan 02, 2015 8:10:36 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.

[Tomas Linhart]

As Google suggests, manually creating the Prefs key under HKEY_LOCAL_MACHINE\Software\JavaSoft should do it.

[Campbell Ritchie]

The code won't compile. You haven't copied it right. You have missed out a { at the beginning of the play method.

[Campbell Ritchie]

And welcome to the Ranch

[Somnath Rakshit]

thanks. it works fine now.

[Campbell Ritchie]

Well done