public List<ExamDTO> getProfessorsPastExams(int profId, int subjectId) {
		List<ExamDTO> exams = new ArrayList<ExamDTO>();
		List<Exam> allExams = examRepository.findAll();
		for(Exam e : allExams) {
			if(e.getSubject().getId() == subjectId && e.getDate().compareTo(new Date()) < 0) {
				ExamDTO examDTO = new ExamDTO(e);
				// examDTO.setRegistered(isExamRegistered(studentId, e.getId()));
				exams.add(examDTO);
			}
		}

		return exams;
	}


	public List<SubjectDTO> getAllProfessorSubjects(int id) {
		List<SubjectDTO> professorSubjectsDTO = new ArrayList<>();
		List<Subject> subjects = subjectRepository.findAll();
		User u = userRepository.getOne(id);
		for (Subject s : subjects) {
			for (Professor professor : s.getProfessors()) {
				if (professor.getId() == u.getProfessor().getId()) {
					List<ExamDTO> exams = new ArrayList<ExamDTO>();
					exams = getStudentsNextExams(professor.getId(), s.getId());
					professorSubjectsDTO.setExams(exams);
					professorSubjectsDTO.add(new SubjectDTO(s));

				}
			}
		}
		return professorSubjectsDTO;
	}