CascadeType.PERSIST not working

[Duran Harris]

Hi Guys..

Could someone please point out to me where I might be going wrong?I'm trying to make sure that when an Item is persisted it's bids get persisted as well...I am using this property in my persistence.xml:

    <property name="hibernate.hbm2ddl.auto" value="create-drop"/> 

At the moment I can persist a bid or an item but persisting an Item will only result in an Item being added to the item table,not it's related Bids..
I have the following two entities(modified from the ActionBazaar app):

  package entities;

import java.io.Serializable;
import javax.persistence.*;

/**
 * Entity implementation class for Entity: Bid
 *
 */
@Entity

public class Bid implements Serializable {

	   
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	@Column(name="BidID")
	private int id;
	
	@ManyToOne(cascade=CascadeType.PERSIST)
	@JoinColumn(name="item")
	private Item item;
	
	@Column(name="BidAmount")
	private double bidAmount;
	@Column(name="UserID")
	private int userID;
	
	private static final long serialVersionUID = 1L;

	public Bid() {
		super();
	}

	

	/**
	 * @return the bid_id
	 */
	public int getId() {
	    return id;
	}



	/**
	 * @return the item
	 */
	public Item getItem() {
	    return item;
	}



	/**
	 * @param bidId the bid_id to set
	 */
	public void setId(int bidId) {
	    id = bidId;
	}



	/**
	 * @param item the item to set
	 */
	public void setItem(Item item) {
	    this.item = item;
	}



	/**
	 * @return the bidAmount
	 */
	public double getBidAmount() {
	    return bidAmount;
	}

	/**
	 * @return the userID
	 */
	public int getUserID() {
	    return userID;
	}

	/**
	 * @param itemID the itemID to set
	 */
	public void setItemID(Item item) {
	    this.item = item;
	}

	/**
	 * @param bidAmount the bidAmount to set
	 */
	public void setBidAmount(double bidAmount) {
	    this.bidAmount = bidAmount;
	}

	/**
	 * @param userID the userID to set
	 */
	public void setUserID(int userID) {
	    this.userID = userID;
	}   
	
	
	
   
}

package entities;                                                                                                                               
                                                                                                                                                
import java.io.Serializable;                                                                                                                    
import java.util.HashSet;                                                                                                                       
import java.util.Set;                                                                                                                           
                                                                                                                                                
import javax.persistence.Column;                                                                                                                
import javax.persistence.Entity;                                                                                                                
import javax.persistence.GeneratedValue;                                                                                                        
import javax.persistence.GenerationType;                                                                                                        
import javax.persistence.Id;                                                                                                                    
import javax.persistence.OneToMany;                                                                                                             
                                                                                                                                                
                                                                                                                                                
/**                                                                                                                                             
 * The persistent class for the Item database table.                                                                                            
 *                                                                                                                                              
 */                                                                                                                                             
@Entity                                                                                                                                         
public class Item implements Serializable {                                                                                                     
	private static final long serialVersionUID = 1L;                                                                                        
                                                                                                                                                
	@Id                                                                                                                                     
	@GeneratedValue(strategy=GenerationType.IDENTITY)                                                                                       
	@Column(name="ItemID")                                                                                                                  
	private int itemID;                                                                                                                     
                                                                                                                                                
	@Column(name="Description")                                                                                                             
	private String description;                                                                                                             
                                                                                                                                                
	private String name;                                                                                                                    
                                                                                                                                                
	//bi-directional many-to-one association to Bid                                                                                         
	@OneToMany(mappedBy="item")                                                                                                             
	private Set<Bid> bids;                                                                                                                  
                                                                                                                                                
        public Item() {                                                                                                                         
        }                                                                                                                                       
                                                                                                                                                
	public int getItemID() {                                                                                                                
		return this.itemID;                                                                                                             
	}                                                                                                                                       
                                                                                                                                                
	public void setItemID(int itemID) {                                                                                                     
		this.itemID = itemID;                                                                                                           
	}                                                                                                                                       
                                                                                                                                                
	public String getDescription() {                                                                                                        
		return this.description;                                                                                                        
	}                                                                                                                                       
                                                                                                                                                
	public void setDescription(String description) {                                                                                        
		this.description = description;                                                                                                 
	}                                                                                                                                       
                                                                                                                                                
	public String getName() {                                                                                                               
		return this.name;                                                                                                               
	}                                                                                                                                       
                                                                                                                                                
	public void setName(String name) {                                                                                                      
		this.name = name;                                                                                                               
	}                                                                                                                                       
                                                                                                                                                
	public Set<Bid> getBids() {                                                                                                             
		return this.bids;                                                                                                               
	}                                                                                                                                       
                                                                                                                                                
	public void setBids(Set<Bid> bids) {                                                                                                    
		this.bids = bids;                                                                                                               
	}                                                                                                                                       
	                                                                                                                                        
	public void addBid(Bid b) {                                                                                                             
	    if(bids ==null) {                                                                                                                   
		bids = new HashSet<Bid>();                                                                                                      
	    }                                                                                                                                   
	    bids.add(b);                                                                                                                        
	}                                                                                                                                       
	                                                                                                                                        
}                                                                                                                                               
  

And finally the entity manager code(in my bean's business method):

  EntityManager em = emf.createEntityManager();

	Item item = new Item();
	item.setDescription("An expensive watch");
	item.setName("Seiko Kinetic");
	Bid b = new Bid();
	b.setBidAmount(4000.00);
	item.addBid(b);
	em.persist(item);
	em.close();