What's wrong with @OneToMany and @ManyToOne bidirectional mapping?

Question

Hibernate

When implementing bidirectional mapping, an error occurs, data is added to the database of the child element in which there is no pointer to the parent. I am using PostgreSQL.
Parent

@Entity
@Table(name = "users")
public class User{
    @Id
    @GeneratedValue(generator = "increment")
    @GenericGenerator(name = "increment", strategy = "increment")
    private long id;
    @Column(name = "email")
    private String email;
    @Column(name = "token")
    private String token;
    @Column(name = "first_name")
    private String firstName;
    @Column(name = "last_name")
    private String lastName;
    @Column(name = "level")
    private int level;
    @Column(name = "coins")
    private long coins;
    @Column(name = "avatar")
    private String avatar;
    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
    private List<Quest> quests = new ArrayList<>();
//Конструктор,геттеры и сеттеры

child element

@Entity
@Table(name = "quests")
public class Quest {
    @Id
    @GeneratedValue(generator = "increment")
    @GenericGenerator(name = "increment", strategy = "increment")
    private long id;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "user_id")
    private User user;
//Конструктор, геттеры и сеттеры

In the child's database, the pointer to the parent is always null. If you write user_id manually, then everything works.

Answer 1

Sorry for the stupid question, I thought Hibernate itself prescribes the Parent element. Issue resolved