双向OneToMany / ManyToOne不起作用

Question

我的问题是，向子项添加父实体的集合并不会在拥有方设置外键。任何人都可以给我提示吗？我在这里做错了什么？

// Entity Class: Paket
@OneToMany(mappedBy = "paket", cascade = CascadeType.ALL, targetEntity = Komponente.class, fetch = FetchType.EAGER)
    private List<Komponente> komponenten;

    public void setKomponenten(List<Komponente> komponenten) {
        this.komponenten = komponenten;
    }

    public List<Komponente> getKomponenten() {
        return komponenten;
    }

// Entity Class: Komponente
@ManyToOne()
private Paket paket;

// Using EJB -> Excerpt from abstract service class
@Transactional
    public T edit(T entity) throws OptimisticLockException {
        try {
            T myEntity = getEntityManager().merge(entity);
            getEntityManager().flush();
            return myEntity;
        } catch (OptimisticLockException ex) {
            throw ex;
        }

        //System.out.println("Entity Merged: " + entity);
    }

// Performing merge
Paket p = this.paketFacade.find(new Long(1));
p.setKomponenten(komponenteInSelectedPaketList);
this.selectedPaket = this.paketFacade.edit(p);