Связанная таблица и автоинкремент в Spring

...
    @RequestMapping(value = "/addStudent", method = RequestMethod.POST)
    public String addStudent(@ModelAttribute("student") Student student, HttpServletRequest request ) {
 
        student.setDisciplines(disciplineDAO.getAllDisciplines());
        studentDAO.addStudent(student);
...

...
@Entity(name = "Student")
@Table(schema = "public", name = "students")
public class Student extends Person {
...
    @ManyToMany(cascade = { CascadeType.ALL } )
    @LazyCollection(LazyCollectionOption.FALSE)
    @JoinTable(
            name = "disciplines_to_students",
            joinColumns = { @JoinColumn(name = "student_id") },
            inverseJoinColumns = { @JoinColumn(name = "discipline_id") }
    )
    private List<Discipline> disciplines;
...

...
@Entity
@Table(schema = "public", name = "disciplines")
public class Discipline {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private long id;
...

...
    public void deleteStudent (long id) {
        Session session = sessionFactory.getCurrentSession();
        session.delete(getStudentById(id));
        session.flush();
    }
...

cascade = { CascadeType.ALL }