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本文介紹了為什么在嘗試使用LWJGL庫加載聲音時出現錯誤&NoClassDefFoundError：Sun/Misc/UnSafe&quot；？的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

這是我的Eclipse項目文件的屏幕快照。

當我嘗試在類AudioPlayer的第15行啟動new Sound("Res/MouseClick.ogg")對象時，收到下面的錯誤。

package com.game;
import java.util.HashMap;
import java.util.Map;

import org.newdawn.slick.Music;
import org.newdawn.slick.Sound;

public class AudioPlayer {
    public static Map<String, Sound> soundMap = new HashMap<String, Sound>();
    public static Map<String, Music> musicMap = new HashMap<String, Music>();

    public static void load() {
        try {
            soundMap.put("menu_sound", new Sound("Res/MouseClick.ogg")); // <- throws error
            musicMap.put("music", new Music("Res/Background.ogg"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Music getMusic(String key) {
        return musicMap.get(key);
    }

    public static Sound getSound(String key) {
        return soundMap.get(key);
    }
}

Exception in thread "main" java.lang.NoClassDefFoundError: sun/misc/Unsafe
at lwjgl/org.lwjgl.MemoryUtilSun$AccessorUnsafe.getUnsafeInstance(MemoryUtilSun.java:74)
at lwjgl/org.lwjgl.MemoryUtilSun$AccessorUnsafe.<init>(MemoryUtilSun.java:62)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:166)
at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:404)
at java.base/java.lang.Class.newInstance(Class.java:590)
at lwjgl/org.lwjgl.MemoryUtil.loadAccessor(MemoryUtil.java:324)
at lwjgl/org.lwjgl.MemoryUtil.<clinit>(MemoryUtil.java:66)
at lwjgl/org.lwjgl.openal.ALC10.alcOpenDevice(ALC10.java:202)
at lwjgl/org.lwjgl.openal.AL.init(AL.java:160)
at lwjgl/org.lwjgl.openal.AL.create(AL.java:138)
at lwjgl/org.lwjgl.openal.AL.create(AL.java:102)
at lwjgl/org.lwjgl.openal.AL.create(AL.java:201)
at slick/org.newdawn.slick.openal.SoundStore$1.run(SoundStore.java:295)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:310)
at slick/org.newdawn.slick.openal.SoundStore.init(SoundStore.java:292)
at slick/org.newdawn.slick.Sound.<init>(Sound.java:54)

at Wave/com.game.AudioPlayer.load(AudioPlayer.java:15)
at Wave/com.game.Game.<init>(Game.java:37)
at Wave/com.game.Game.main(Game.java:157)

Caused by: java.lang.ClassNotFoundException: sun.misc.Unsafe
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 23 more

推薦答案

從您發布的集成開發環境屏幕快照中，我可以看到您正在使用

Java 12和
Java模塊系統(module-info.java)

請注意，sun/misc/Unsafe是(舊版)Java內部API，因此在使用Java模塊系統時，默認情況下會將其封裝(隱藏)。