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出現的錯誤信息如下：

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

解決方法如下：

Step1：搜索並運行regedit.exe

Step2: 進入HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft，右擊JavaSoft目錄，選擇新建->項（key），命名為Prefs

Step3: 重新編譯即可。