Why are links not established during table auto-generation?

Question

MySQL

Why, after auto-generation of tables,
spring.jpa.hibernate.ddl-auto=create
there are no links between tables in the database using hibernate? And how can they be installed?
This is how the database tables look like:

In fact, two classes are inherited from the user in the code: student, teacher.
the student has a many-to-many relationship to the room; the teacher has a one-to-many relationship.
Listing of models/entities:

@Entity
@Table(name = "rooms")
public class Room {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    @Column(name = "name")
    String name;
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "teacher_id")
    private Teacher teacher;
    @ManyToMany(mappedBy = "createdRooms")
    private List<Student> students;
}

@Entity
@Table(name = "users")
@Inheritance
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @Column(name = "login")
    private String login;

    @Column(name = "password")
    private String password;
}

@Entity
@DiscriminatorValue("TEACHER")
public class Teacher extends User {
    @OneToMany(mappedBy = "teacher",
            cascade = CascadeType.ALL,
            orphanRemoval = true)
    private List<Room> createdRooms;
}

@Entity
@DiscriminatorValue("STUDENT")
public class Student extends User {
    @ManyToMany(cascade = {
            CascadeType.PERSIST,
            CascadeType.MERGE})
    @JoinTable(name = "students_rooms",
            joinColumns = @JoinColumn(name = "student_id"),
            inverseJoinColumns = @JoinColumn(name = "room_id"))
    private List<Room> createdRooms;
}

What could be the reason? And how to fix it?