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（取自好headfirst Java）：

 1 import javax.sound.midi.*;
 2
 3 public class MiniMiniMusicApp {
 4     public static void main(String[] args) {
 5         MiniMiniMusicApp mini = new MiniMiniMusicApp();
 6         mini.play();
 7     }
 8     public void play() {
 9         try {
10             Sequencer player = MidiSystem.getSequencer();
11             player.open();
12
13             Sequence seq = new Sequence(Sequence.PPQ, 4);
14
15             Track track = seq.createTrack();
16
17             ShortMessage a = new ShortMessage();
18             a.setMessage(144, 1, 44, 100);
19             MidiEvent noteOn = new MidiEvent(a, 1);
20             track.add(noteOn);
21
22             ShortMessage b = new ShortMessage();
23             b.setMessage(128, 1, 44, 100);
24             MidiEvent noteOff = new MidiEvent(b, 16);
25             track.add(noteOff);
26
27             player.setSequence(seq);
28
29             player.start();
30         } catch (Exception ex) {
31             ex.printStackTrace();
32         }
33
34     }
35 }

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。