eBook reading error

I have tried to read a epub file for which im using http://www.siegmann.nl/epublib/android. Im trying the same sample which is given in the link, but im getting java.lang.NoClassDefFoundError . I tried all the way i can. Even by changing by adt,eclipse but i cant able to solve this issue. Please look into it and provide me some suggestions.

04-20 15:08:47.735: E/AndroidRuntime(4329): FATAL EXCEPTION: main
04-20 15:08:47.735: E/AndroidRuntime(4329): java.lang.ExceptionInInitializerError
04-20 15:08:47.735: E/AndroidRuntime(4329):     at com.sample.pubreader.EPubReaderActivity.onCreate(EPubReaderActivity.java:30)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1780)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.ActivityThread.access$1500(ActivityThread.java:132)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.os.Looper.loop(Looper.java:143)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at android.app.ActivityThread.main(ActivityThread.java:4196)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at java.lang.reflect.Method.invokeNative(Native Method)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at java.lang.reflect.Method.invoke(Method.java:507)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-20 15:08:47.735: E/AndroidRuntime(4329):     at dalvik.system.NativeStart.main(Native Method)
04-20 15:08:47.735: E/AndroidRuntime(4329): Caused by: java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory
04-20 15:08:47.735: E/AndroidRuntime(4329):     at nl.siegmann.epublib.epub.EpubReader.<clinit>(EpubReader.java:33)
04-20 15:08:47.735: E/AndroidRuntime(4329):     ... 14 more

Eventhough my code is similar to the above link,Im providing the code also.

public class EPubReaderActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        AssetManager assetManager = getAssets();
        try {
          // find InputStream for book
          InputStream epubInputStream = assetManager
              .open("sample.epub");

          // Load Book from inputStream
          Book book = (new EpubReader()).readEpub(epubInputStream);

          // Log the book's authors
          Log.i("epublib", "author(s): " + book.getMetadata().getAuthors());

          // Log the book's title
          Log.i("epublib", "title: " + book.getTitle());

          // Log the book's coverimage property
          Bitmap coverImage = BitmapFactory.decodeStream(book.getCoverImage()
              .getInputStream());
          Log.i("epublib", "Coverimage is " + coverImage.getWidth() + " by "
              + coverImage.getHeight() + " pixels");

          // Log the tale of contents
          logTableOfContents(book.getTableOfContents().getTocReferences(), 0);
        } catch (IOException e) {
          Log.e("epublib", e.getMessage());
        }
    }
    private void logTableOfContents(List<TOCReference> tocReferences, int depth) {
        if (tocReferences == null) {
          return;
        }
        for (TOCReference tocReference : tocReferences) {
          StringBuilder tocString = new StringBuilder();
          for (int i = 0; i < depth; i++) {
            tocString.append("\t");
          }
          tocString.append(tocReference.getTitle());
          Log.i("epublib", tocString.toString());

          logTableOfContents(tocReference.getChildren(), depth + 1);
        }
      }
}

回答1:

I solved the problem by adding the two another jar files

slf4j-api and slf4j-simple. The slf4j-android has the dependency on the libraries which i have mentioned.

Thanks for your help.

回答2:

I think you forgot to add the slf4j-android library to your project. If you look at the link you've supplied, it says:

Getting started

Download epublib-core-latest.jar from https://github.com/downloads/psiegman/epublib/epublib-core-latest.jar

Download slf4j-android

Add both to your android project

Make sure both libraries are on your build path.

回答3:

Just Add those two mentioned jars in the Libs folder. If the Libs folder is not in project structure, create one and add those jars. The error will go away.