удаление строки из смежной таблицы при обновлении сущности (связь многие ко многим)

Updating existing actor
Hibernate: 
    /* load my.project.one.entity.Actor */ select
        actor0_.actor_id as actor_id1_0_0_,
        actor0_.birth_date as birth_da2_0_0_,
        actor0_.first_name as first_na3_0_0_,
        actor0_.gender as gender4_0_0_,
        actor0_.last_name as last_nam5_0_0_,
        actor0_.country as country6_0_0_ 
    from
        actors actor0_ 
    where
        actor0_.actor_id=?
Hibernate: 
    select
        films0_.actor_id as actor_id1_1_0_,
        films0_.film_id as film_id2_1_0_,
        film1_.film_id as film_id1_2_1_,
        film1_.country as country2_2_1_,
        film1_.duration as duration3_2_1_,
        film1_.genre as genre4_2_1_,
        film1_.name as name5_2_1_,
        film1_.producerfk_id as producer8_2_1_,
        film1_.release as release6_2_1_,
        film1_.money as money7_2_1_ 
    from
        actors_films films0_ 
    inner join
        films film1_ 
            on films0_.film_id=film1_.film_id 
    where
        films0_.actor_id=?
Actor saved with id: 8
Hibernate: 
    /* update
        my.project.one.entity.Actor */ update
            actors 
        set
            birth_date=?,
            first_name=?,
            gender=?,
            last_name=?,
            country=? 
        where
            actor_id=?
Hibernate: 
    /* delete collection my.project.one.entity.Actor.films */ delete 
        from
            actors_films 
        where
            actor_id=?

в сущности Актер
@ManyToMany(cascade = CascadeType.PERSIST)
    @JoinTable(name = "actors_films",
            joinColumns = @JoinColumn(name = "actor_id"),
            inverseJoinColumns = @JoinColumn(name = "film_id"))
    private Set<Film> films = new HashSet<Film>();
 
в сущности фильм
@ManyToMany(mappedBy = "films")
    private Set<Actor> actors = new HashSet<Actor>();