带有HttpResponseCache和DiskLruCache的java.lang.NoClassDefFoundError

我正在尝试在新项目Android中测试此缓存库。
运行项目时，我得到以下Logcat：

01-24 03:45:31.109: E/AndroidRuntime(1983): FATAL EXCEPTION: main
01-24 03:45:31.109: E/AndroidRuntime(1983): Process: com.test_cache, PID: 1983
01-24 03:45:31.109: E/AndroidRuntime(1983): java.lang.NoClassDefFoundError: com.jakewharton.DiskLruCache
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.integralblue.httpresponsecache.compat.libcore.net.http.HttpResponseCache.<init>(HttpResponseCache.java:83)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.integralblue.httpresponsecache.HttpResponseCache.<init>(HttpResponseCache.java:155)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.integralblue.httpresponsecache.HttpResponseCache.install(HttpResponseCache.java:192)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.test_cache.MainActivity.onCreate(MainActivity.java:21)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.Activity.performCreate(Activity.java:5243)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2140)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2226)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.ActivityThread.access$700(ActivityThread.java:135)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1397)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.os.Handler.dispatchMessage(Handler.java:102)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.os.Looper.loop(Looper.java:137)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at android.app.ActivityThread.main(ActivityThread.java:4998)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at java.lang.reflect.Method.invokeNative(Native Method)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at java.lang.reflect.Method.invoke(Method.java:515)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
01-24 03:45:31.109: E/AndroidRuntime(1983):     at dalvik.system.NativeStart.main(Native Method)

我从我的libs文件夹中复制了Craig Andrews的HttpResponseCache项目和Jake Wharton的DiskLruCache项目中的两个jar ：

这是我的MainActivity.java：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final long httpCacheSize = 10 * 1024 * 1024; // 10 MiB
    final File httpCacheDir = new File(getCacheDir(), "http");

    try {
        com.integralblue.httpresponsecache.HttpResponseCache.install(httpCacheDir, httpCacheSize);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }        
}

我在其他线程中读到了订单问题，因此在Java Build Path的Order＆Export选项卡中，将其放在首位：

我清理了proyect，进行了重建，但无济于事，问题仍然存在……
任何想法……？

谢谢。