Program: 4339
Project: 4339
Buggy source:
/** 
 * Provide nearest date for last execution.
 * @param date - jodatime DateTime instance. If null, a NullPointerException will be raised.
 * @return DateTime instance, never null. Last execution time.
 */
public DateTime lastExecution(DateTime date){
  Validate.notNull(date);
  NearestValue secondsValue=seconds.getPreviousValue(date.getSecondOfMinute(),1);
  NearestValue minutesValue=minutes.getPreviousValue(date.getMinuteOfHour(),secondsValue.getShifts());
  NearestValue hoursValue=hours.getPreviousValue(date.getHourOfDay(),minutesValue.getShifts());
  NearestValue monthsValue;
  int month=1;
  int day=1;
  if (months.getValues().contains(date.getMonthOfYear())) {
    monthsValue=new NearestValue(date.getMonthOfYear(),0);
    day=date.getDayOfMonth();
  }
 else {
    monthsValue=months.getPreviousValue(date.getMonthOfYear(),0);
    month=monthsValue.getValue();
    day=new DateTime(date.getYear(),month,1,1,1).dayOfMonth().withMaximumValue().getDayOfMonth();
  }
  TimeNode days=new TimeNode(generateDayCandidates(date.getYear(),month));
  NearestValue daysValue=days.getPreviousValue(day,hoursValue.getShifts());
  monthsValue=months.getPreviousValue(month,daysValue.getShifts());
  if (daysValue.getShifts() > 0) {
    days=new TimeNode(generateDayCandidates(date.getYear(),monthsValue.getValue()));
    List<Integer> dayCandidates=days.getValues();
    daysValue=new NearestValue(dayCandidates.get(dayCandidates.size() - 1),0);
  }
  NearestValue yearsValue=new TimeNode(generateYearCandidates(date.getYear())).getPreviousValue(date.getYear(),monthsValue.getShifts());
  return new DateTime(yearsValue.getValue(),monthsValue.getValue(),daysValue.getValue(),hoursValue.getValue(),minutesValue.getValue(),secondsValue.getValue());
}

Fixed version (ground truth):
/** 
 * Provide nearest date for last execution.
 * @param date - jodatime DateTime instance. If null, a NullPointerException will be raised.
 * @return DateTime instance, never null. Last execution time.
 */
public DateTime lastExecution(DateTime date){
  Validate.notNull(date);
  NearestValue secondsValue=seconds.getPreviousValue(date.getSecondOfMinute(),1);
  NearestValue minutesValue=minutes.getPreviousValue(date.getMinuteOfHour(),secondsValue.getShifts());
  NearestValue hoursValue=hours.getPreviousValue(date.getHourOfDay(),minutesValue.getShifts());
  NearestValue monthsValue;
  int month=1;
  int day=1;
  if (months.getValues().contains(date.getMonthOfYear())) {
    monthsValue=new NearestValue(date.getMonthOfYear(),0);
    day=date.getDayOfMonth();
  }
 else {
    monthsValue=months.getPreviousValue(date.getMonthOfYear(),0);
    month=monthsValue.getValue();
    day=new DateTime(date.getYear(),month,1,1,1).dayOfMonth().withMaximumValue().getDayOfMonth();
  }
  TimeNode days=new TimeNode(generateDayCandidates(date.getYear(),month,((DayOfWeekFieldDefinition)cronDefinition.getFieldDefinition(CronFieldName.DAY_OF_WEEK)).getMondayDoWValue()));
  NearestValue daysValue=days.getPreviousValue(day,hoursValue.getShifts());
  monthsValue=months.getPreviousValue(month,daysValue.getShifts());
  if (daysValue.getShifts() > 0) {
    days=new TimeNode(generateDayCandidates(date.getYear(),monthsValue.getValue(),((DayOfWeekFieldDefinition)cronDefinition.getFieldDefinition(CronFieldName.DAY_OF_WEEK)).getMondayDoWValue()));
    List<Integer> dayCandidates=days.getValues();
    daysValue=new NearestValue(dayCandidates.get(dayCandidates.size() - 1),0);
  }
  NearestValue yearsValue=new TimeNode(generateYearCandidates(date.getYear())).getPreviousValue(date.getYear(),monthsValue.getShifts());
  return new DateTime(yearsValue.getValue(),monthsValue.getValue(),daysValue.getValue(),hoursValue.getValue(),minutesValue.getValue(),secondsValue.getValue());
}