My entities representing a one-to-many:
@Entity
@Table(name = "Users")
public class User {
@Id
@GeneratedValue
private int id = -1;
@OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
private List<SignIn> signIns;
}
@Entity
@Table(name = "SignIns")
public class SignIn {
@Id
@GeneratedValue
private int id;
@ManyToOne
private User user;
public SignIn(User user) {
this.user = user;
}
}
When I persist a User and then persist a SignIn with the created User, everything works fine (each table will have 1 row). When I reuse the created User to persist another sign in, the first sign in row gets replaced by the new sign in.
The code that persists:
User user = new User();
persist(user);
SignIn signIn = new SignIn(user);
SignIn signIn2 = new SignIn(user);
persist(signIn);
persist(signIn2);
private void persist(Object entity) {
EntityManager em = entityManagerFactory.createEntityManager();
EntityTransaction tx = em.getTransaction();
try {
tx.begin();
em.merge(entity);
tx.commit();
} finally {
if (tx.isActive()) {
tx.rollback();
}
em.close();
}
}
What did I overlook?
