Mensaje de error de Java java.util.prefs.WindowsPreferences

¿Qué causa el siguiente mensaje de advertencia/error? ¿Y cómo deshacerse de él?

Dec 31, 2021 3:10:05 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.

Tengo una clase NotePlayer.java y un programa de prueba NotePlayerTest.java, y cuando ejecuto este último, funciona bien, pero obtengo el mensaje de advertencia anterior, el cual me gustaría rectificar.

Un fragmento de NotePlayer:

import javax.sound.midi.*;

public class NotePlayer {

/**
     *  Program: NotePlayer.java
     *  Purpose: Simple musical note player, plays a single note.
     *  Creator: Chris Clarke
     *  Created: July 2007
     */

MidiChannel[]    mc;
   Synthesizer      synth;
   Instrument[]     instr;
   int          tmpo = 500; // fixed tempo of 120 beats/minute
   boolean      done = false;

public void loadInstr() {
      // only necessary to run this method once
      if (done) return;

  for (int voice=0; voice<16; voice++) {
     try {
        synth = MidiSystem.getSynthesizer();
        synth.open();
        mc = new MidiChannel[16];
        mc = synth.getChannels();
        instr = synth.getDefaultSoundbank() .getInstruments();
        synth.loadInstrument (instr[voice]); // 0-15
     }
     catch (Exception e) { System.out.println("Caught exception"); }
  }
  done = true;
} // end loadInstr()

public void playNote(int voice, int pitch, int duration, int vol) {
      // play note
      mc[voice].noteOn(pitch, vol);
      for (int i=0; i<duration; i++) {
         try {
            thread.sleep(tmpo/4); // pause for one semiquaver
         } catch (interruptedexception e) {}
      }
      // stop playing note
      mc[voice].noteoff(pitch, vol);
   } // end playnote(int, int, int, int)

y mi archivo noteplayertest.java es el siguiente:

public class noteplayertest {

/**
     *  program:    noteplayertest.java by chris clarke
     *  created:    04 july 2007
     *  purpose:    test my noteplayer class
     */

public static void main(string[] args) {
      noteplayer np = new noteplayer();
      np.loadinstr();
      // parameters are voice (0-15), pitch, duration, volume
      np.playnote(2, 42, 4, 600);
      np.playnote(2, 46, 4, 600);
      np.playnote(2, 49, 4, 600);
   }
}
``` i++)="" {="" try="" {="" thread.sleep(tmpo/4);="" pause="" for="" one="" semiquaver="" }="" catch="" (interruptedexception="" e)="" {}="" }="" stop="" playing="" note="" mc[voice].noteoff(pitch,="" vol);="" }="" end="" playnote(int,="" int,="" int,="" int)="" ```="" y="" mi="" archivo="" noteplayertest.java="" es="" el="" siguiente:="" ```="" public="" class="" noteplayertest="" {="" **="" *="" program:="" noteplayertest.java="" by="" chris="" clarke="" *="" created:="" 04="" july="" 2007="" *="" purpose:="" test="" my="" noteplayer="" class="" */="" public="" static="" void="" main(string[]="" args)="" {="" noteplayer="" np="new" noteplayer();="" np.loadinstr();="" parameters="" are="" voice="" (0-15),="" pitch,="" duration,="" volume="" np.playnote(2,="" 42,="" 4,="" 600);="" np.playnote(2,="" 46,="" 4,="" 600);="" np.playnote(2,="" 49,="" 4,="" 600);="" }="" }=""></duration; i++) {
         try {
            thread.sleep(tmpo/4); // pause for one semiquaver
         } catch (interruptedexception e) {}
      }
      // stop playing note
      mc[voice].noteoff(pitch, vol);
   } // end playnote(int, int, int, int)

y mi archivo noteplayertest.java es el siguiente:

“`
public class noteplayertest {

/**
* program: noteplayertest.java by chris clarke
* created: 04 july 2007
* purpose: test my noteplayer class
*/

public static void main(string[] args) {
noteplayer np = new noteplayer();
np.loadinstr();
// parameters are voice (0-15), pitch, duration, volume
np.playnote(2, 42, 4, 600);
np.playnote(2, 46, 4, 600);
np.playnote(2, 49, 4, 600);
}
}
“`>