criteria.setResultTransformer(Criteria.DISTINCT_ROOT_ENTITY)

@Entity
@Table(name = "address_book" )
public class AddressBook implements Serializable {
 
    private static final long serialVersionUID = 4136348580478451825L;
 
    @Id
    private Long id;
 
    @Column
    private String name;
    
    @OneToMany(fetch=FetchType.EAGER)
    @JoinColumn(name="address_book_id" )
    private Set<Contact> contacts = new HashSet<Contact>();
    
    (get/set blabla...)
 
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (int) (id ^ (id >>> 32));
        return result;
    }
 
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        AddressBook other = (AddressBook) obj;
        if (id != other.id)
            return false;
        return true;
    }
 
}

@Entity
public class Contact implements Serializable {
    private static final long serialVersionUID = 1L;
    
    @Id
    private Long id;
    
    @Column
    private String name;
    
    @Column
    private String email;
    
    (get/set blabla...)
 
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if ((obj == null) || (obj.getClass() != this.getClass()))
            return false;
        Contact contact = (Contact) obj;
        return (name == contact.name || (name != null && name
                .equals(contact.name)));
    }
 
    @Override
    public int hashCode() {
        int hash = 7;
        hash = 31 * hash + name.hashCode();
        return hash;
    }
 
}

List list = getSession().createCriteria(AddressBook.class).list();