@Entity
@Table(name = "BASKET")
@SequenceGenerator(name = "sq_basket",sequenceName = "BASKET_SEQ_ID", initialValue=1)
public class Basket implements java.io.Serializable {

   // Fields

   @Id
   @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="sq_basket") 
   @Column(name = "ID")
   private Integer entityId;

   @Column(name = "REFERENCE")
   private String reference;
   
   @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)   
   @JoinTable( name="PRODUCT_BASKET",joinColumns={@JoinColumn(name="BASKET_ID", referencedColumnName="ID")},
   inverseJoinColumns={@JoinColumn(name="PRODUCT_ID", referencedColumnName="ID")})
   private Set<Product> products = new HashSet<Product>(0);

............
............

   public Set<Product> getProducts() {
      return Collections.unmodifiableSet(products);
   }

@Test
public void testAddRemoveBasketProducts() {

   // Create new Basket
   Basket basket = new Basket("201008SN01");      
   manager.addProduct(basket, "hard-drive", "SANL100HD01", "seagate SATAII", 899.00);
   manager.addProduct(basket, "hard-drive", "SANL100HD02", "seagate SATAII", 899.00);

   manager.save(basket);

   Basket testBasket = manager.getBasket("201008SN01");

   // test is data was persistet successfully
   assertNotNull(testBasket);
   assertEquals(testBasket.getReference(), "201008SN01");

   // Lazy load the products
   products =   testBasket.getProducts();

   for (Product product : products) {
      assertEquals(product.getName(), "hard-drive");
   }      
}

// called by manager.save(basket);
public void save(Basket transientInstance) {
   log.debug("saving Basket instance");
   try {
      getCurrentSession().save(transientInstance);
      log.debug("save successful");
   } catch (RuntimeException re) {
      log.error("save failed", re);
      throw re;
   }
}

// called by manager.getBasket("201008SN01");
public Basket findBasketByReference(String reference) {
   log.debug("finding Basket instance by customer's refence number"
         + ", value: " + reference);
   try {         
        String hql = "from Basket where reference = ?";
        Query query = getCurrentSession().createQuery(hql);
        query.setMaxResults(1).setString(0, reference);
        return (Basket) query.uniqueResult();         
   } catch (RuntimeException re) {
      log.error("find by reference number failed", re);
      throw re;
   }
}

products =   testBasket.getProducts();