Program: 161502
Project: 161502
Buggy source:
private static boolean put(Calendar date,Context context,FavoriteFoodAlarmEntry favoriteFoodAlarmEntry){
synchronized (scheduledEntries) {
    Calendar today=Calendar.getInstance();
    today.setTime(Utils.getDate(Utils.getDateString(today.getTime())));
    for (    Calendar calendar : scheduledEntries.keySet()) {
      if (calendar.before(today)) {
        scheduledEntries.remove(calendar);
      }
    }
    int yearScheduled=date.get(Calendar.YEAR);
    int dayOfYearScheduled=date.get(Calendar.DAY_OF_YEAR);
    int hourScheduled=date.get(Calendar.HOUR_OF_DAY);
    int minuteScheduled=date.get(Calendar.MINUTE);
    today=Calendar.getInstance();
    int year=today.get(Calendar.YEAR);
    int dayOfYear=today.get(Calendar.DAY_OF_YEAR);
    CafeteriaNotificationSettings cfs=new CafeteriaNotificationSettings(context);
    Pair<Integer,Integer> preferredHourAndMinute=cfs.retrieveHourMinute(date);
    int inMinutesScheduled=hourScheduled * 60 + minuteScheduled;
    int inMinutesPreferred=preferredHourAndMinute.first * 60 + preferredHourAndMinute.second;
    if (yearScheduled == year && dayOfYear == dayOfYearScheduled && inMinutesScheduled >= inMinutesPreferred) {
      return false;
    }
    HashSet<FavoriteFoodAlarmEntry> alarmEntries;
    if (scheduledEntries.containsKey(date)) {
      alarmEntries=scheduledEntries.get(date);
    }
 else {
      alarmEntries=new HashSet<>();
    }
    int sizeBefore=alarmEntries.size();
    alarmEntries.add(favoriteFoodAlarmEntry);
    scheduledEntries.put(date,alarmEntries);
    new FavoriteDishAlarmScheduler(date,favoriteFoodAlarmEntry.getContext());
    return (alarmEntries.size() > sizeBefore);
  }
}

Fixed version (ground truth):
/** 
 * @param date date as day, month, year. all other values like minutes, seconds etc. have to be zero
 * @param context
 * @param favoriteFoodAlarmEntry
 * @return
 */
private static boolean put(Calendar date,Context context,FavoriteFoodAlarmEntry favoriteFoodAlarmEntry){
synchronized (scheduledEntries) {
    Calendar today=Calendar.getInstance();
    today.setTime(Utils.getDate(Utils.getDateString(today.getTime())));
    if (date.before(today)) {
      return false;
    }
    for (    Calendar calendar : scheduledEntries.keySet()) {
      if (calendar.before(today)) {
        scheduledEntries.remove(calendar);
      }
    }
    int yearScheduled=date.get(Calendar.YEAR);
    int dayOfYearScheduled=date.get(Calendar.DAY_OF_YEAR);
    today=Calendar.getInstance();
    int year=today.get(Calendar.YEAR);
    int dayOfYear=today.get(Calendar.DAY_OF_YEAR);
    int currentMinutes=today.get(Calendar.HOUR_OF_DAY) * 60 + today.get(Calendar.MINUTE);
    if (year == yearScheduled && dayOfYear == dayOfYearScheduled) {
      CafeteriaNotificationSettings cfs=new CafeteriaNotificationSettings(context);
      Pair<Integer,Integer> preferredHourAndMinute=cfs.retrieveHourMinute(date);
      int inMinutesPreferred=preferredHourAndMinute.first * 60 + preferredHourAndMinute.second;
      if (currentMinutes >= inMinutesPreferred) {
        return false;
      }
    }
    HashSet<FavoriteFoodAlarmEntry> alarmEntries;
    if (scheduledEntries.containsKey(date)) {
      alarmEntries=scheduledEntries.get(date);
    }
 else {
      alarmEntries=new HashSet<>();
    }
    int sizeBefore=alarmEntries.size();
    alarmEntries.add(favoriteFoodAlarmEntry);
    scheduledEntries.put(date,alarmEntries);
    new FavoriteDishAlarmScheduler(date,favoriteFoodAlarmEntry.getContext());
    return (alarmEntries.size() > sizeBefore);
  }
}