WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5

以下是我的程序（取自headfirst Java）：

 import javax.sound.midi.*;

 public class MiniMiniMusicApp {
     public static void main(String[] args) {
         MiniMiniMusicApp mini = new MiniMiniMusicApp();
         mini.play();
     }
     public void play() {
         try {
             Sequencer player = MidiSystem.getSequencer();
             player.open();

             Sequence seq = new Sequence(Sequence.PPQ, 4);

             Track track = seq.createTrack();

             ShortMessage a = new ShortMessage();
             a.setMessage(144, 1, 44, 100);
             MidiEvent noteOn = new MidiEvent(a, 1);
             track.add(noteOn);

             ShortMessage b = new ShortMessage();
             b.setMessage(128, 1, 44, 100);
             MidiEvent noteOff = new MidiEvent(b, 16);
             track.add(noteOff);

             player.setSequence(seq);

             player.start();
         } catch (Exception ex) {
             ex.printStackTrace();
         }

     }
 }

在win8.1出现的错误信息如下：

WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0 
x80000002. Windows RegCreateKeyEx(...) returned error code 5.

解决方法如下：

Step1：搜索并运行regedit.exe

Step2: 进入HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft，右击JavaSoft目录，选择新建->项（key），命名为Prefs

Step3: 重新编译即可。