JobIntentService ends prematurely starting with Oreo

[Xerxes Linde]

After oreo, my service ends prematurely. My goal is to fix that. From the main activity, I run

    Intent mServiceIntent = new Intent();
    mServiceIntent.putExtra(....)
    ...
    HintergrundDienst.enqueueWork(getBaseContext(),HintergrundDienst.class,JI,mServiceIntent);

HintergrundDienst

    public class HintergrundDienst extends JobIntentService {
        public static volatile boolean shouldContinue = true;
        public static volatile boolean rauschen = false;
        public static volatile boolean laeuft = true;
        static final int JOB_ID = 1000;
        static final int ONGOING_NOTIFICATION_ID = 33;    
        PowerManager.WakeLock wakeLock;
  
        static void enqueueWork(Context context, Intent work) {
            enqueueWork(context, HintergrundDienst.class, JOB_ID, work);
        }
  
        Notification notification;
        @RequiresApi(api = Build.VERSION_CODES.O)
        void vordergrund(String Titel, String Text)
        {
            Intent notificationIntent = new Intent(this, HintergrundDienst.class);
            PendingIntent pendingIntent =
                    PendingIntent.getActivity(this, 0, notificationIntent, 0);
  
  
            NotificationManager mNotificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
  
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationChannel channel = new NotificationChannel(Titel,
                        Text,
                        NotificationManager.IMPORTANCE_DEFAULT);
                channel.setSound(null,null);
                mNotificationManager.createNotificationChannel(channel);
            }
  
  
            notification =
                    new Notification.Builder(this,Titel)
                            .setContentTitle(Titel)
                            .setContentText(Text)
                            .setSmallIcon(R.drawable.kleinesicon)
                            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                            .setContentIntent(pendingIntent)
                            .setTicker("setTicker")
                            .build();
  
            startForeground(ONGOING_NOTIFICATION_ID, notification);
        }
      
        [USER=1021285]@override[/USER]
        protected void onHandleWork(Intent intent) {
            PowerManager powerManager = (PowerManager) getSystemService(POWER_SERVICE);
            wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                    "MyWakelockTag");
            wakeLock.acquire();
            vordergrund(intent.getStringExtra("test"),"Titel");
            //Some long task
  
        }
  
        [USER=1021285]@override[/USER]
        public void onDestroy() {
            super.onDestroy();
            stopForeground(true);
            wakeLock.release();
        }
    }

Now, onDestroy in `HintergrundDienst` is run without `//Some long task` having finished. It seems like a timer is running and no matter the wakelock, the service is being terminated.

How do I prevent this from happening prematurely?

I tried `startForegroundService` in the main activity, but it only wants an intent. How does it know which service to start, if I cannot pass `HintergrundDienst` or `HintergrundDienst.class` to it?