Реализовать компилятор Java в приложении для Android

Question

Я должен сделать это для университета:

Как внедрить Java-компилятор и DEX-конвертер в приложение для Android?

Мой процесс:

Я создал новый проект, с основной деятельностью. в основной деятельности в методе onCreate, я добавляю этот кусок кода (взять из URL сверху)

File storage = getDir("all41", Context.MODE_PRIVATE);

System.err.println("copying the android.jar from asssets to the internal storage to make it available to the compiler");
BufferedInputStream bis = null;
OutputStream dexWriter = null;
int BUF_SIZE = 8 * 1024;

try {
    bis = new BufferedInputStream(getAssets().open("android.jar"));
    dexWriter = new BufferedOutputStream(
      new FileOutputStream(storage.getAbsolutePath() + "/android.jar"));
    byte[] buf = new byte[BUF_SIZE];
    int len;
    while((len = bis.read(buf, 0, BUF_SIZE)) > 0) {
      dexWriter.write(buf, 0, len);
    }
    dexWriter.close();
    bis.close();
} catch (Exception e) {
    System.err.println("Error while copying from assets: " + e.getMessage());
    e.printStackTrace();
}

System.err.println("instantiating the compiler and compiling the java file"); 
org.eclipse.jdt.internal.compiler.batch.Main ecjMain = new org.eclipse.jdt.internal.compiler.batch.Main(new PrintWriter(System.out), new PrintWriter(System.err), false/*noSystemExit*/, null);
ecjMain.compile(new String[] {"-classpath", storage.getAbsolutePath()+"/android.jar", Environment.getExternalStorageDirectory().getAbsolutePath() + "/Test.java"});

System.err.println("calling DEX and dexifying the test class"); 
com.android.dx.command.Main.main(new String[] {"--dex", "--output=" + storage.getAbsolutePath() + "/Test.zip", Environment.getExternalStorageDirectory().getAbsolutePath() + "/./Test.class"});

System.err.println("instantiating DexClassLoader, loading class and invoking toString()");
DexClassLoader cl = new DexClassLoader(storage.getAbsolutePath() + "/Test.zip", storage.getAbsolutePath(), null, getClassLoader());

try {
    Class libProviderClazz = cl.loadClass("Test");
    Object instance = libProviderClazz.newInstance();
    System.err.println(instance.toString());
} catch (Exception e) {
    System.err.println("Error while instanciating object: " + e.getMessage());
    e.printStackTrace();
}

а потом я создал Test.java

public String toString() {
    return "Hallo Welt!";
}

Теперь я добавляю в свойства проекта jdt-core.jar и dx.jar.

Когда я запускаю приложение, я получаю следующую ошибку:

04-18 12:46:40.169: W/dalvikvm(1314): VFY: unable to resolve static method 3386: Lcom/android/dx/command/Main;.main ([Ljava/lang/String;)V
04-18 12:46:40.179: D/dalvikvm(1314): VFY: replacing opcode 0x71 at 0x00af
04-18 12:46:40.648: W/System.err(1314): copying the android.jar from asssets to the internal storage to make it available to the compiler
04-18 12:46:40.648: W/System.err(1314): Error while copying from assets: android.jar
04-18 12:46:40.648: W/System.err(1314): java.io.FileNotFoundException: android.jar
04-18 12:46:40.668: W/System.err(1314):         at android.content.res.AssetManager.openAsset(Native Method)
04-18 12:46:40.668: W/System.err(1314):         at android.content.res.AssetManager.open(AssetManager.java:315)
04-18 12:46:40.668: W/System.err(1314):         at android.content.res.AssetManager.open(AssetManager.java:289)
04-18 12:46:40.668: W/System.err(1314):         at com.example.compilatore.MainActivity.onCreate(MainActivity.java:33)
04-18 12:46:40.668: W/System.err(1314):         at android.app.Activity.performCreate(Activity.java:5104)
04-18 12:46:40.668: W/System.err(1314):         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-18 12:46:40.668: W/System.err(1314):         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-18 12:46:40.679: W/System.err(1314):         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-18 12:46:40.679: W/System.err(1314):         at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-18 12:46:40.679: W/System.err(1314):         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-18 12:46:40.679: W/System.err(1314):         at android.os.Handler.dispatchMessage(Handler.java:99)
04-18 12:46:40.679: W/System.err(1314):         at android.os.Looper.loop(Looper.java:137)
04-18 12:46:40.688: W/System.err(1314):         at android.app.ActivityThread.main(ActivityThread.java:5041)
04-18 12:46:40.688: W/System.err(1314):         at java.lang.reflect.Method.invokeNative(Native Method)
04-18 12:46:40.688: W/System.err(1314):         at java.lang.reflect.Method.invoke(Method.java:511)
04-18 12:46:40.688: W/System.err(1314):         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-18 12:46:40.688: W/System.err(1314):         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-18 12:46:40.688: W/System.err(1314):         at dalvik.system.NativeStart.main(Native Method)
04-18 12:46:40.688: W/System.err(1314): instantiating the compiler and compiling the java file
04-18 12:46:40.698: W/System.err(1314): calling DEX and dexifying the test class
04-18 12:46:40.698: D/AndroidRuntime(1314): Shutting down VM
04-18 12:46:40.698: W/dalvikvm(1314): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-18 12:46:40.718: E/AndroidRuntime(1314): FATAL EXCEPTION: main
04-18 12:46:40.718: E/AndroidRuntime(1314): java.lang.NoClassDefFoundError: com.android.dx.command.Main
04-18 12:46:40.718: E/AndroidRuntime(1314):         at com.example.compilatore.MainActivity.onCreate(MainActivity.java:57)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.Activity.performCreate(Activity.java:5104)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.os.Handler.dispatchMessage(Handler.java:99)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.os.Looper.loop(Looper.java:137)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at android.app.ActivityThread.main(ActivityThread.java:5041)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at java.lang.reflect.Method.invokeNative(Native Method)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at java.lang.reflect.Method.invoke(Method.java:511)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-18 12:46:40.718: E/AndroidRuntime(1314):         at dalvik.system.NativeStart.main(Native Method)