如何持久化一个与JPA中的其他实体有ManyToMany关联的实体？

@Entity
public class EntityA {
    @Id
    private Long id;

    @ManyToMany
    @JoinTable(name = "a_b",
            joinColumns = @JoinColumn(name = "a_id"),
            inverseJoinColumns = @JoinColumn(name = "b_id"))
    private List<EntityB> entitiesB;
    
    // Getters and setters
}

@Entity
@IdClass(ABId.class)
public class AB {
    @Id
    @ManyToOne
    @JoinColumn(name = "a_id")
    private EntityA entityA;

    @Id
    @ManyToOne
    @JoinColumn(name = "b_id")
    private EntityB entityB;
    
    // Getters and setters
}

@Embeddable
public class ABId implements Serializable {
    @ManyToOne
    @JoinColumn(name = "a_id")
    private EntityA entityA;

    @ManyToOne
    @JoinColumn(name = "b_id")
    private EntityB entityB;
    
    // Getters and setters
}

EntityA entityA = new EntityA();
EntityB entityB1 = new EntityB();
EntityB entityB2 = new EntityB();

entityA.getEntitiesB().add(entityB1);
entityA.getEntitiesB().add(entityB2);

entityManager.persist(entityA);