@Transient
    public Item getSingleItem() {
        if (items==null || items.isEmpty())
            return null;
        else
            return this.items.iterator().next();
    }

    /**
     * @param item
     */
    public void setItem(Item item) {
        // add the item as the (only) item.
        if (this.items==null)
            this.items= new HashSet<Item>();
        else
            this.items.clear();
       
        this.item.add(item);
    }

    /**
     * To work around the (current) inability of Hibernate to support Cascade.Delete_Orphan on a OneToOne
     * mapping, we are mapping this as one to many, with derived fields that get/set only one item.
     * This collection mapping will actually only ever hold a single item.
     */
    @OneToMany(mappedBy = "xxxx", fetch=FetchType.LAZY)
    @Cascade({CascadeType.DELETE_ORPHAN, CascadeType.ALL})
    public Set<Item> getItemsHibernateOnly() {
        return Items;
    }
   
    public void setItemsHibernateOnly(Set<Item> items) {
        this.items= items;
    }