How Do I Create Many to Many Hibernate Mapping for Additional Property from the Join Table?

I need a many to many hibernate mapping needed 3 joins. I've tried to find out a solution without intermediate entity like LecturerCourse.

I have a many to many relation in my database between my lecturer and course tables. A course can be given by several lecturer while a lecturer can give several courses.

I have courses stored before hand. However, I need to assign courses to lecturer. When I assign courses I also store the capacity of that course.

My database diagram:

I use hibernate and spring. I need a hibernate mapping when a course is assign any lecturer. I need to add values to capacity field.

My lecturer mapping :

@Entity
@Table(name="LECTURER")
public class Lecturer {

    @Id 
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="LECTURER_ID_SEQ")
    @SequenceGenerator(name="LECTURER_ID_SEQ", sequenceName="LECTURER_ID_SEQ")
    private Long Id;

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

    @Column(name="SURNAME")
    private String surname;


    @Column(name="EMAIL")
    private String email;

    @Column(name="USERNAME")
    private String username;

    @Column(name="PASSWORD")
    private String Password;

    @ManyToMany
    @JoinTable(
          name="LECTURER_COURSE",
          joinColumns=@JoinColumn(name="LECTURER_ID"),
          inverseJoinColumns=@JoinColumn(name="COURSE_ID")
      )
    private List<Course> courses;

    //getters - setters
}

My course mapping :

@Entity
@Table(name="COURSE")
public class Course {

    @Id 
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="COURSE_ID_SEQ")
    @SequenceGenerator(name="COURSE_ID_SEQ", sequenceName="COURSE_ID_SEQ")
    private Long id;

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

    @Column(name="CODE")
    private String code;
}

Any idea