package helper;


import java.util.HashSet;
import java.util.Set;

public class User {

   private Long id;
   private String first_name;
   private String second_name;
   private String user_name;
   private String password;
   private Set addresses;
   private Set phone;
   private String email;
   private boolean admin;
   private Department department;
   
   public User(String first_name,String second_name,String user_name,String password
         ,String email){
      this.first_name=first_name;
      this.second_name=second_name;
      this.user_name=user_name;
      this.password=password;
      this.email=email;
      addresses=new HashSet();
      phone=new HashSet();
   }
   
   public User(){
      first_name="first";
      second_name="second";
      user_name="user name";
      password="password";
      email="email@yahoo.com";
      addresses=new HashSet();
      phone=new HashSet();
   }
// getters and setters

package helper;

public class Address {
   
   private Long id;
   private User user;
   private String country;
   private String city;
   private String street;
   private String building;
   private int appartment;
   
   public Address(){
      country="default";
      city="default";
      street="default";
      building="default";
      appartment=0;
   }
   
   public Address(String country,String city,String street,
         String building,String appartment){
      this.country=country;
      this.city=city;
      this.street=street;
      this.building=building;
      if(appartment !=null && appartment.length()>0)
         this.appartment=Integer.parseInt(appartment);
      else
         this.appartment=0;
   }
//getters and setters

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="helper">
  <class name="User" table="user_table"
  dynamic-update="true">
    <id name="id"
       column="user_id"
        >
        <generator class="native"/>
     </id>
     
     <property name="first_name"
        column="user_first_name"
        type="string"/>
        
     <property name="second_name"
        column="user_second_name"
        type="string"/>
        
     <property name="user_name"
        column="user_name"
        type="string"/>
        
     <property name="password"
        column="user_password"
        type="string"/>
        
     <set name="addresses"
        outer-join="true"
        inverse="true"
        cascade="all-delete-orphan">
        <key column="address_id" />
        <one-to-many class="Address" />
    </set>
        
     <set name="phone"
        inverse="true"
        cascade="all-delete-orphan">
        <key column="user_phone" />
        <one-to-many class="Phone"/>
    </set>
     <property name="email"
        column="user_email"
        type="string"/>
     
     <property name="admin"
        column="user_admin"
        type="boolean"/>
        
      <many-to-one name="department"
       column="user_department"/>
        
        
  </class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="helper">
  <class name="Address" table="address_table" dynamic-update="true">
 
     <id name="id"
        column="address_id">
     <generator class="native"/>
     </id>
     
     <many-to-one
        name="user"
      column="user_id"
      class="helper.User"
      not-null="true"/>
      
   <property name="country"
        column="address_country"
        type="string"/>
        
     <property name="city"
        column="address_city"
        type="string"/>
        
     <property name="street"
        column="address_street"
        type="string"/>
        
     <property name="building"
        column="address_building"
        type="string"/>
        
     <property name="appartment"
        column="address_appartment"
        type="int"/>
  </class>
</hibernate-mapping>

         Vector usersVector=null;
         
         SessionFactory sessionFactory=new  Configuration().configure().buildSessionFactory();
         Session newSession=sessionFactory.openSession();
         Transaction transaction=newSession.beginTransaction();
         
         java.util.List results= newSession.createCriteria(User.class).setFetchMode("addresses", FetchMode.EAGER).addOrder(Order.asc("first_name")).list();
         
         Iterator iter=results.iterator();
         if(iter.hasNext())
            usersVector=new Vector();
         while(iter.hasNext()){
            User user=(User)iter.next();
            usersVector.add(user);
         }
         
         
         
         for(int i=0;i<usersVector.size();i++){
            User user=(User) usersVector.elementAt(i);
            Iterator it=user.getAddresses().iterator();
            Address ad=null;
            if(it.hasNext())
               ad=(Address)it.next(); 
               System.out.println("____user____"+user.getFirst_name());
              System.out.println("_____ad_____"+ad);
              if(ad !=null)
              System.out.println("____country__"+ad.getCountry());
         }
         
         transaction.commit();
         newSession.close();
         

<set name="addresses"
        outer-join="true"
        inverse="true"
        cascade="all-delete-orphan">
        <key column="address_id" /> //Here is problem
        <one-to-many class="Address" />
    </set>

Correct One is

<set name="addresses"
        outer-join="true"
        inverse="true"
        cascade="all-delete-orphan">
        <key column="user_id" />
        <one-to-many class="Address" />
    </set>

Criteria.setResultTransformer(CriteriaSpecification.DISTINCT_ROOT_ENTITY );