complex composite id

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@Entity
@Table
@IdClass(ItemSiteId.class)
public class ItemSite {

	@Id
	@ManyToOne
	private Item item;

	@Id
	@ManyToOne
	private Site site;

	public ItemSite() {
	}

	public ItemSite(Item item, Site site) {
		this.item = item;
		this.site = site;
	}

}

@Entity
@Table
@IdClass(ItemSiteId.class)
public class ItemSite {

	@Id
	@ManyToOne
	private Item item;

	@Id
	@ManyToOne
	private Site site;

	public ItemSite() {
	}

	public ItemSite(Item item, Site site) {
		this.item = item;
		this.site = site;
	}

}

@Entity
@Table
@IdClass(ItemId.class)
public class Item {

	@Id
	@Column(columnDefinition = "INT")
	private Integer id;

	@Id
	@JoinColumn(name = "manufacturer_id", columnDefinition = "INT")
	private Integer manufacturerId;

	public Item() {
	}

	public Item(Integer id, Integer manufacturerId) {
		this.id = id;
		this.manufacturerId = manufacturerId;
	}

	public Integer getId() {
		return this.id;
	}

	public Integer getManufacturerId() {
		return this.manufacturerId;
	}

}

@Entity
@Table
public class Site implements java.io.Serializable {

	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue
	Integer id;

	public Site() {
	}

	public Site(Integer id) {
		this.id = id;
	}

	public Integer getId() {
		return this.id;
	}

}

public class ItemSiteId implements Serializable {

	private static final long serialVersionUID = 1822540289216799357L;

	private ItemId item;

	private Integer site;

	public ItemSiteId() {
	}

	public ItemSiteId(ItemId item, Integer site) {
		this.item = item;
		this.site = site;
	}

}