Example of @CollectionId in Hibernate

 @CollectionId(columns = @Column(name="collection_id"), type=@Type(type="long"), generator = "country_id_gen" )
 

@Entity
public class Country implements Serializable {
	private static final long serialVersionUID = 1L;
         ------------------	
	@Column(name="name")
	private String name;
	
	@ManyToMany
	@JoinTable(name="state")
	@CollectionId(columns = @Column(name="collection_id"), type=@Type(type="long"), generator = "country_id_gen" )
	private Collection<State> states = new ArrayList<State>();
	-----------------
}