[jboss-user] [EJB 3.0] - Re: what happen with my entity bean , need expert help

[ejbiva]

hi ALRubinger,the SessionBean just as follows
@Stateful
public class ShoppingCartBean implements ShoppingCart
{
   @Inject
   private EntityManager manager;
   private Order order;

   public void buy(String product, int quantity, double price)
   {
      if (order == null) order = new Order();
      order.addPurchase(product, quantity, price);
   }

   public Order getOrder()
   {
      return order;
   }


   public void checkout()
   {
      manager.create(order);
   }
}
/// Entity bean
@Entity
@Table(name = "PURCHASE_ORDER")
public class Order implements java.io.Serializable
{
   private int id;
   private double total;
   private Collection lineItems;

   @Id(generate = GeneratorType.AUTO)
   public int getId()
   {
      return id;
   }

   public void setId(int id)
   {
      this.id = id;
   }

   public double getTotal()
   {
      return total;
   }

   public void setTotal(double total)
   {
      this.total = total;
   }

   public void addPurchase(String product, int quantity, double price)
   {
      if (lineItems == null) lineItems = new ArrayList();
      LineItem item = new LineItem();
      item.setOrder(this);
      item.setProduct(product);
      item.setQuantity(quantity);
      item.setSubtotal(quantity * price);
      lineItems.add(item);
      total += quantity * price;
   }

   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
   @JoinColumn(name = "order_id")
   public Collection getLineItems()
   {
      return lineItems;
   }

   public void setLineItems(Collection lineItems)
   {
      this.lineItems = lineItems;
   }
}

@Entity
@Table(name = "order_line_item")
public class LineItem implements java.io.Serializable
{
   private int id;
   private double subtotal;
   private int quantity;
   private String product;
   private Order order;


   @Id(generate = GeneratorType.AUTO)
   public int getId()
   {
      return id;
   }

   public void setId(int id)
   {
      this.id = id;
   }

   public double getSubtotal()
   {
      return subtotal;
   }

   public void setSubtotal(double subtotal)
   {
      this.subtotal = subtotal;
   }

   public int getQuantity()
   {
      return quantity;
   }

   public void setQuantity(int quantity)
   {
      this.quantity = quantity;
   }

   public String getProduct()
   {
      return product;
   }

   public void setProduct(String product)
   {
      this.product = product;
   }

   @ManyToOne
   @JoinColumn(name = "order_id")
   public Order getOrder()
   {
      return order;
   }

   public void setOrder(Order order)
   {
      this.order = order;
   }
}
/////// and testing console as follows
public class Client
{
   public static void main(String[] args) throws Exception
   {
      InitialContext ctx = new InitialContext();
//      ShoppingCart cart = (ShoppingCart) ctx.lookup(ShoppingCart.class.getName());
//Calculator calculator = (Calculator) ctx.lookup("CalculatorBean/remote");
	ShoppingCart cart = (ShoppingCart) ctx.lookup("ShoppingCartBean/remote");
      System.out.println("Buying 2 memory sticks");
      cart.buy("Memory stick", 2, 500.00);
      System.out.println("Buying a laptop");
      cart.buy("Laptop", 1, 2000.00);

      System.out.println("Print cart:");
      Order order = cart.getOrder();
      System.out.println("Total: $" + order.getTotal());
      for (LineItem item : order.getLineItems())
      {
         System.out.println(item.getQuantity() + "     " + item.getProduct() + "     " + item.getSubtotal());
      }

      System.out.println("Checkout");
      cart.checkout();

   }
}

any defect?

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