private void createOfficeHours(Instructor instructor) { for (EventInformation eventInformation : instructor.getOfficeHours()) { Long eventInformationId = commonDao.getEventInformationId(eventInformation); if (eventInformationId == null) { commonDao.createEventInformation(eventInformation); eventInformationId = commonDao.getEventInformationId(eventInformation); } commonDao.createOfficeHours(instructor.getId(), eventInformationId); } }