Hibernate Many-to-many ConstraintViolationException while update - mysql

Question

I have a many-to-many association between Photo and Auteur entities, and 3 tables - AUTEUR, PHOTO_AUTEUR and PHOTO.
My Auteur mapping class:
#Entity
#Table(name = "AUTEUR")
public class Auteur implements Serializable {
#Id
#GeneratedValue
#Column(name = "auteur_id")
private int auteur_id;
#Column(name = "nom")
private String nom;
#Column(name = "prenom")
private String prenom;
#ManyToMany(fetch = FetchType.EAGER, cascade = {CascadeType.ALL},
targetEntity = Photo.class)
#JoinTable(name = "PHOTO_AUTEUR",
joinColumns = {
#JoinColumn(name = "AUTEUR_ID")},
inverseJoinColumns = {
#JoinColumn(name = "PHOTO_ID")})
private Set<Photo> photos = new HashSet<Photo>();
...
}
and a Photo class:
#Entity
#Table(name = "PHOTO")
public class Photo extends News {
#Id
#GeneratedValue
#Column(name = "photo_id")
private int id;
#Column(name = "format")
private String format;
#Column(name = "largeur")
private int largeur;
#Column(name = "hauteur")
private int hauteur;
#Column(name = "siColoree")
private boolean siColoree;
#ManyToMany(mappedBy = "photos", fetch = FetchType.EAGER, cascade = CascadeType.ALL, targetEntity = Auteur.class)
private Set<Auteur> photo_auteurs = new HashSet<>();
#Lob
#Column(name = "image", length = 1000000)
private byte[] image;
...}
and when I try to update or delete Photo entry i get ConstraintViolationException, even if I manually have set cascade deleting and updating in mySql.

Answer 1

It works right without cascade restrictions
SessionFactory sf = HibernateUtil.getSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
session.delete(photo);
session.getTransaction().commit();
session.close();
with such mapping in Photo:
#ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
#JoinTable(name = "PHOTO_AUTEUR",
joinColumns = #JoinColumn(name = "PHOTO_ID"),
inverseJoinColumns = #JoinColumn(name = "AUTEUR_ID"))
private Set<Auteur> photo_auteurs = new HashSet<>();
and in Auteur:
#ManyToMany(fetch = FetchType.EAGER, targetEntity = Photo.class)
#JoinTable(name = "PHOTO_AUTEUR",
joinColumns = {
#JoinColumn(name = "AUTEUR_ID")},
inverseJoinColumns = {
#JoinColumn(name = "PHOTO_ID")})
private Set<Photo> photos = new HashSet<>();