object not locked by thread before notify() in Foreground Service Notification

Question

From android O you cant create simple background service, it has to be foreground, so I followed a tutorial and built one, but, I got this error:

    Unable to start service ...SMSService@302fa17 with Intent 
{ cmp=...SMSService (has extras) }: java.lang.IllegalMonitorStateException: 
object not locked by thread before notify()

I saw some other topics on this, but those are all for old Notifications

Here is my code:

Intent notificationIntent = new Intent(this, MainActivity.class);
        PendingIntent mPendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, 0);

        Notification mNotification = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setContentTitle("Content Title")
                .setContentText("Content Text")                                                                                 
                .setSmallIcon(R.drawable.ic_check)
                .setContentIntent(mPendingIntent)
                .build();

            startForeground(1, mNotification);
            mNotification.notify();

Answer 1

When you try to call notify on specific object it wakes up a single thread that is waiting on this object's monitor.

Since you are not locking any thread, you don't have to use notify(). Remove mNotification.notify();.

As for displaying notification startForeground(1, notification); is enough