当我尝试使用 LWJGL 库加载声音时，为什么会收到错误“NoClassDefFoundError: sun/misc/Unsafe”？

This is the screenshot of my Eclipse project files.

当我尝试启动时出现以下错误new Sound("Res/MouseClick.ogg")我的班级中的对象AudioPlayer在第 15 行。

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

从您发布的 IDE 屏幕截图中我可以看到您正在使用

• Java 12，以及
• Java 模块系统（module-info.java)

注意sun/misc/Unsafe是（遗产）Java内部API因此，在使用 Java 模块系统时，它默认被封装（隐藏）。

为了让您的应用程序（以及您使用的库）访问它，您需要将其显式包含在您的应用程序中module-info.java通过增加requires jdk.unsupported;

或者，您也可以不使用 Java 模块系统——在这种情况下它应该可以正常工作。不过，我建议继续使用模块系统。