public class Address implements Serializable
{
    protected Long addressID;
    protected String street;
    protected String city;
    protected String state;
    protected String zip;
    protected Set<Person> people;
}

public class Person implements Serializable
{
    protected Long personID;
    protected String name;
    protected Address address;
}

<class name="tests.Address" table="addresses" lazy="true">

    <id name="addressID" type="java.lang.Long" column="AddressID">
        <generator class="native"/>
    </id>
   
    <property name="street" type="java.lang.String" column="Street" length="128"/>
    <property name="city" type="java.lang.String" column="City" length="32"/>
    <property name="state" type="java.lang.String" column="State" length="2"/>
    <property name="zip" type="java.lang.String" column="Zip" length="10"/>
   
    <!-- bi-directional one-to-many association to CollectionObject -->
    <set name="people" lazy="true" inverse="true" cascade="none">
        <key>
            <column name="AddressID"/>
        </key>
        <one-to-many class="tests.Person"/>
    </set>
   
</class>

<class name="tests.Person" table="people" lazy="true">

    <id name="personID" type="java.lang.Long" column="PersonID">
        <generator class="native"/>
    </id>
   
    <property name="name" type="java.lang.String" column="Name" length="128"/>
   
    <many-to-one name="address" class="tests.Address" column="AddressID" not-null="true" outer-join="true" cascade="none"/>
   
</class>

        Address addr = new Address();
        addr.setStreet("1345 Jayhawk Blvd");
        addr.setCity("Lawrence");
        addr.setState("KS");
        addr.setZip("66045");
       
        Person p = new Person();
        p.setName("Bob");
       
        p.setAddress(addr);
        addr.getPeople().add(p);

        Transaction tx = s.beginTransaction();
        s.saveOrUpdate(p);
        s.saveOrUpdate(addr);
        tx.commit();

        Transaction tx = s.beginTransaction();
        s.saveOrUpdate(addr);
        s.saveOrUpdate(p);
        tx.commit();