<hibernate-mapping>
    <class
        name="samples_0.Car"
        table="SAMPLE0_CAR"
    >

        <id
            name="CAR_ID"
            column="CAR_ID"
            type="java.lang.Long"
            unsaved-value="null"
        >
            <generator class="hilo">
                <param name="table">SAMPLE0_CAR_SEQ</param>
                <param name="column">NEXT</param>
              <!--
                  To add non XDoclet generator parameters, create a file named
                  hibernate-generator-params-Person.xml
                  containing the additional parameters and place it in your merge dir.
              -->
            </generator>
        </id>

        <property
            name="CAR_NAME"
            update="true"
            insert="true"
            not-null="false"
            unique="false"
            type="defaultString"
        >
            <column name="CAR_NAME" default="n/a"/>
        </property>

        <many-to-one
            name="person"
            class="samples_0.Person"
            cascade="all"
            column="PERSON_ID"
            unique="true"
        />

    </class>
</hibernate-mapping>

public class Car
{
    Person person=null;
    Long CAR_ID=null;
    String CAR_NAME="";
    ...with getters and setters foreach attribute defined.
}

<hibernate-mapping
>
    <typedef class="java.lang.String" name="defaultString">
        <param name="default">n/a</param>
    </typedef>
    <class
        name="samples_0.Person"
        table="SAMPLE0_Person"
    >

        <id
            name="PERSON_ID"
            column="PERSON_ID"
            type="java.lang.Long"
            unsaved-value="null"
        >
            <generator class="hilo">
                <param name="table">SAMPLE0_PERSON_SEQ</param>
                <param name="column">NEXT</param>
              <!--
                  To add non XDoclet generator parameters, create a file named
                  hibernate-generator-params-Person.xml
                  containing the additional parameters and place it in your merge dir.
              -->
            </generator>
        </id>

        <property
            name="FIRST_NAME"
            update="true"
            insert="true"
            not-null="false"
            unique="false"
            type="defaultString"
        >
            <column name="FIRST_NAME" default="n/a"/>
        </property>

        <property
            name="LAST_NAME"
            type="java.lang.String"
            update="true"
            insert="true"
            column="LAST_NAME"
            not-null="true"
            unique="false"
        />
        <sql-delete callable="true">{? = call deletePerson (?)}</sql-delete>
    </class>
</hibernate-mapping>

public class Person
{
    Long PERSON_ID=null;
    String FIRST_NAME=null;
    String LAST_NAME=null;
    ...with getters and setters foreach attribute defined.
}

Person p1 = new Person();
p1.setFIRST_NAME("JEFF");
p1.setLAST_NAME("JOHnson");
Car c=new Car();
c.setCAR_NAME("BMW");
c.setPerson(p1);
sess.saveOrUpdate(c);

tx.commit();

System.out.println("c.getPerson().getPERSON_ID() = " + c.getPerson().getPERSON_ID());
System.out.println("p1.getPERSON_ID() = " + p1.getPERSON_ID());

drop table SAMPLE0_PERSON;
drop table SAMPLE0_PERSON_SEQ;
create table SAMPLE0_PERSON
(
    PERSON_ID number primary key,
    FIRST_NAME varchar2(64),
    LAST_NAME varchar2(64),
    created timestamp default systimestamp
);
create table SAMPLE0_PERSON_SEQ
(
   NEXT number default 0
);
insert into SAMPLE0_person_seq values(1);
commit;

-- for the one-to-one relationship
create table SAMPLE0_CAR_SEQ
(
   NEXT number default 0
);
insert into SAMPLE0_CAR_SEQ values(1);
commit;

drop table SAMPLE0_CAR;
create table SAMPLE0_CAR
(
CAR_ID number primary key,
CAR_NAME varchar2(256),
PERSON_ID number
);
alter table sample0_car add constraint fk_car_person foreign key (person_id)
references sample0_person(person_id);