Не удается найти символ NOTIFICATION_SERVICE?

package com.test.app;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class runOnBoot extends BroadcastReceiver{

   @Override
   public void onReceive(Context context, Intent intent) {

          NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
   }
}

Когда я пытаюсь собрать пакет, он говорит

compile:
    [javac] Compiling 2 source files to /home/mrburns/Desktop/myapp/bin/classes
    [javac] /home/mrburns/Desktop/myapp/src/com/test/app/runOnBoot.java:14: cannot find symbol
    [javac] symbol  : variable NOTIFICATION_SERVICE
    [javac] location: class runOnBoot
    [javac]           NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
    [javac]                                                                                           ^
    [javac] 1 error

BUILD FAILED