public class Employee implements Serializable{
   @Id@GeneratedValue
   @Column(name="OBJECTID")
   private Long objectId;   
   @Column (name="FIRST_NAME")
   private String firstName;
   @Column(name="LAST_NAME")
   private String lastName;
   @ManyToOne (cascade={CascadeType.PERSIST, CascadeType.MERGE})
   @JoinColumn (name="LOCATION")
   private Location location;
   @CollectionOfElements(targetElement=Contact.class)
   @JoinTable(name="hiber_test_contact", joinColumns={@JoinColumn (name="EMPLOYEE_ID")})   
   @IndexColumn(name="SORT")      
   private List<Contact> contacts;

public class Contact implements Serializable{
   @Id@GeneratedValue(strategy=GenerationType.AUTO)
   private Long objectId;   
   @Column(name="EMPLOYEEID")
   private Long employeeId;   
   @Column(name="SORT",unique=true)   
   private Integer sort;   
   @Column(name="CONTCT")
   private String contact;   
   @Column(name="COMMENT")
   private String comment;