title: Runtime Error in Android Adv trying SLF4j - Logback
body: <p>I want to use <strong>slf4j with logback in my Android application</strong> (IDE Eclipse).
  I have already added the jars file (slf4j-api-1.7.1 logback-android-1.0.7-1.jar) to build path in Eclipse.
  I try to launch my app in Adv with the following simple main activity </p>
  
  <pre><code>import org.slf4j.Logger
  import org.slf4j.LoggerFactory
  public class MainActivity extends Activity{
      private static final Logger logger = 
                LoggerFactory.getLogger(MainActivity.class);
      private void onnCreate(Bundle svedInstanceState){
           super.onCreate(savedInstanceState) 
           logger.debug("MainActivity created");
      }
  }
  </code></pre>
  
  <p>and i get the following error captured by logcat</p>
  
  <pre><code>10-02 16:03:46.911: I/dalvikvm(619): Could not find method org.slf4j.LoggerFactory.getLogger, referenced from method com.mbm.activity.MainActivity.&lt;clinit&gt;
  10-02 16:03:46.911: W/dalvikvm(619): VFY: unable to resolve static method 3250: Lorg/slf4j/LoggerFactory;.getLogger (Ljava/lang/Class;)Lorg/slf4j/Logger;
  10-02 16:03:46.941: I/dalvikvm(619): Could not find method org.slf4j.Logger.debug, referenced from method com.mbm.activity.MainActivity.onToggleClicked
  10-02 16:03:46.941: W/dalvikvm(619): VFY: unable to resolve interface method 3248: Lorg/slf4j/Logger;.debug (Ljava/lang/String;)V
  10-02 16:03:46.941: I/dalvikvm(619): Could not find method org.slf4j.Logger.info, referenced from method com.mbm.activity.MainActivity.onToggleClicked
  10-02 16:03:46.941: W/dalvikvm(619): VFY: unable to resolve interface method 3249: Lorg/slf4j/Logger;.info (Ljava/lang/String;)V
  10-02 16:03:46.951: W/dalvikvm(619): Exception Ljava/lang/NoClassDefFoundError; thrown while initializing Lcom/mbm/activity/MainActivity;
  10-02 16:03:46.951: W/dalvikvm(619): Class init failed in newInstance call (Lcom/mbm/activity/MainActivity;)
  10-02 16:03:46.951: W/dalvikvm(619): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
  10-02 16:03:46.961: E/AndroidRuntime(619): FATAL EXCEPTION: main
  10-02 16:03:46.961: E/AndroidRuntime(619): java.lang.ExceptionInInitializerError
  10-02 16:03:46.961: E/AndroidRuntime(619):  at java.lang.Class.newInstanceImpl(Native Method)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at java.lang.Class.newInstance(Class.java:1319)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.ActivityThread.access$600(ActivityThread.java:130)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.os.Handler.dispatchMessage(Handler.java:99)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.os.Looper.loop(Looper.java:137)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at android.app.ActivityThread.main(ActivityThread.java:4745)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at java.lang.reflect.Method.invokeNative(Native Method)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at java.lang.reflect.Method.invoke(Method.java:511)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
  10-02 16:03:46.961: E/AndroidRuntime(619):  at dalvik.system.NativeStart.main(Native Method)
  10-02 16:03:46.961: E/AndroidRuntime(619): Caused by: java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory
  10-02 16:03:46.961: E/AndroidRuntime(619):  at com.mbm.activity.MainActivity.&lt;clinit&gt;(MainActivity.java:41)
  10-02 16:03:46.961: E/AndroidRuntime(619):  ... 15 more
  </code></pre>
  
  <p>Please help me.</p>