Save to database

User user = new User("Wouter", new BCryptPasswordEncoder().encode("123"), true);
        userRepository.save(user);
        Group group = new Group("Group1");
        groupRepository.save(group);
        userRepository.flush();
        groupRepository.flush();

        Group g = groupRepository.findByName("Group1").get();
        User p = userRepository.findUserById(1);

        Date date = new Date(System.currentTimeMillis());
        Reservation res = new Reservation(p, g, date, 0, 1);
        reservationRepository.save(res);
        System.out.println(res);