NullPointerException : println needs a message in android

Question

in my media player i play a song from sdcard. it shows error as NullPointerException : println needs a message e in android. i tried long time but i do not know the reason .please assist me.

code:

    try {         mediaPlayer = new  MediaPlayer();         mediaPlayer.setDataSource("/sdcard/t1.mp3");         seek.setMax(mediaPlayer.getDuration());         mediaPlayer.prepare();         mediaPlayer.start();         mediaPlayer.setOnCompletionListener(this);               }     catch(Exception ex){         Log.e("sdcard-err2:",ex.getMessage());  //  null pointer exception : println needs a message      }   

Log cat:

     05-16 19:27:54.491: ERROR/AndroidRuntime(6889): Caused by: java.lang.NullPointerException: println needs a message      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     at android.util.Log.println(Native Method)      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     at android.util.Log.e(Log.java:208)      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     at com.seek.bar.media3.onCreate(media3.java:43)      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)      05-16 19:27:54.491: ERROR/AndroidRuntime(6889):     ... 11 more 

Answer 1

For anyone else that gets this, try replacing the lone method call or variable name with "" + varName.

For example,

Log.d("LOGCAT", getErrorMsg()); 

becomes

Log.d("LOGCAT", "" + getErrorMsg()); 

Answer 2

In the catch, use:

String err = (ex.getMessage()==null)?"SD Card failed":ex.getMessage(); Log.e("sdcard-err2:", err); 

Passing null to the second argument of a Log logging function throws that error, regardless of the source.