import java.util.*;import javax.ejb.*;public class ProductEJB implements EntityBean {   public String productId;   public String description;   public double price;   private EntityContext context;   public void setPrice(double price) {      this.price = price;   }   public double getPrice() {      return price;   }   public String getDescription() {      return description;   }   public String ejbCreate(String productId, String description,       double price) throws CreateException {      if (productId == null) {         throw new CreateException("The productId is required.");      }      this.productId = productId;      this.description = description;      this.price = price;      return null;   }   public void setEntityContext(EntityContext context) {      this.context = context;   }   public void ejbActivate() {       productId = (String)context.getPrimaryKey();   }   public void ejbPassivate() {      productId = null;      description = null;   }   public void ejbRemove() { }   public void ejbLoad() { }   public void ejbStore() { }   public void unsetEntityContext() { }   public void ejbPostCreate(String productId, String description,       double balance) { }} // ProductEJB