private String TAG = getClass().getSimpleName();

DBModel dbModel; // this is injected room model in appComponent

public UIUpdaterWorker(@NonNull Context context, @NonNull WorkerParameters workerParams) {
    super(context, workerParams);
}

@NonNull
@Override
public Result doWork() {
    Log.d(TAG, dbModel.toString()); // here is null
    return Result.success();