@Entity
@Table(name= "MX_MASTER")
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="MAST_MEMEX_INDORG", discriminatorType= DiscriminatorType.STRING)
public class Master extends ObjectEntity
{
@Id
    @GeneratedValue(generator = "oid")
    @GenericGenerator(name = "oid",strategy = "org.hibernate.id.IncrementGenerator")
    @Column(name="MAST_ID")
    protected Long id;

/**
     * A set of Address that belongs to this Master record. This variable maps
     * to MX_ADDRESS via hibernate.
     *
     */
    @OneToMany(mappedBy="owner")
    @Cascade(value={CascadeType.ALL, CascadeType.DELETE_ORPHAN})
    @Where(clause="CT_CODE='addr'")
    @OrderBy("id ASC")
    protected Set<Address> addresses = new TreeSet<Address>();

/**
     * A Set of Emails that belongs to this Master record. This variable maps to
     * MX_ADDRESS via hibernate.
     */
    @OneToMany(mappedBy="owner")
    @Cascade(value={CascadeType.ALL, CascadeType.DELETE_ORPHAN})
    @Where(clause="CT_CODE='email'")
    @OrderBy("id ASC")
    protected Set<Email> emails = new TreeSet<Email>();

/**
     * A set of Phone numbers that belongs to this Master record. This variable
     * maps to MX_ADDRESS via hibernate.
     */
    @OneToMany(mappedBy="owner")
    @Cascade(value={CascadeType.ALL, CascadeType.DELETE_ORPHAN})
    @Where(clause="CT_CODE='phone'")
    @OrderBy("id ASC")
    protected Set<Phone> phones = new TreeSet<Phone>();


/**
     * A set of category preferences that this Master record belongs to. This variable
     * maps to MX_LIST via hibernate.
     *     
     */
    @OneToMany(mappedBy="member")
    @Cascade(value={CascadeType.ALL, CascadeType.DELETE_ORPHAN})
    @Where(clause="LIST_CODE in(select L.LIST_CODE from MX_LIST L where L.LIST_TYPE='INT')")
    protected Set<ListMember> categories = new HashSet<ListMember>();
...

  /**
     * Method - Adds an address to the set of addresses
     *
     * @param Address
     * @return void
     */
    public void addAddress(Address address)
    {
       if (address != null)
       {
           address.setOwner(this);
           addContactInfo(address, this.addresses);
       }
    }

  /**
     * Method - adds a category to the master
     *
     * @param comm
     * @see committees
     */
    public boolean addCategory(List category, String writeIn) throws TooManyCategoryException
    {
          if (isCategoryMember(category))
          return false;
       ListMember lm = new ListMember(category, this);
       lm.setLastUpdateDate(new Date());
       if(writeIn != null)
           lm.setWriteIn(writeIn);
       return addCategory(lm);
    }

  /**
     * Method - Adds a contact info (Phone, Address, Url, Fax or Email) to their
     * respective set
     *
     * @param <T>
     * @param info
     * @param infos
     */
   
    protected <T extends ContactInfo> void addContactInfo(T info, Set<T> infos)
    {
       infos.add(info);
       if ((new Boolean(true)).equals(info.getPreferred()) || infos.size() == 1)
           setPreferredContactInfo(info, infos);       
    }


}

@Entity
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name="CT_CODE",  discriminatorType = DiscriminatorType.STRING)
@Table(name= "MX_ADDRESS")
public class ContactInfo extends ObjectEntity
{
/**
     * This variable maps to MX_ADDRESS.ADDR_ID via hibernate.
     */
    @Id
    @GeneratedValue(generator = "oid")
    @GenericGenerator(name = "oid",strategy = "org.hibernate.id.IncrementGenerator")
    @Column(name="ADDR_ID")
    protected Long id;

...}

@Entity
@DiscriminatorValue("addr")
public class Address extends ContactInfo
{

/**
     * This variable maps to MX_ADDRESS.MAST_ID via hibernate.
     */
    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="MAST_ID")
    private Master owner;

@Entity
@Table(name= "MX_LIST_MEMBERSHIP")
public class ListMember extends ObjectEntity
{
@Id
    @GeneratedValue(generator = "oid")
    @GenericGenerator(name = "oid",strategy = "org.hibernate.id.IncrementGenerator")
    @Column(name="LM_ID")
    private Long id;


/**
     * This variable maps to MX_LIST_MEMBERSHIP.MAST_ID via hibernate.
     */
    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="MAST_ID")
    private Master member;

}