Example - 1

This Android application has registered to handle a URL when sent an intent:

// ...// 
// ...// 


String URL = intent.getStringExtra("URLToOpen");int length = URL.length();
// ...// 
if("com.example.URLHandler.openURL".equals(intent.getAction())) {}@Overridepublic void onReceive(Context context, Intent intent) {}IntentFilter filter = new IntentFilter("com.example.URLHandler.openURL");MyReceiver receiver = new MyReceiver();registerReceiver(receiver, filter);public class UrlHandlerReceiver extends BroadcastReceiver {}

The application assumes the URL will always be included in the intent. When the URL is not present, the call to getStringExtra() will return null, thus causing a null pointer exception when length() is called.