@Entity
@IdClass(GirlPK.class)
public class Girl{
    private int id;
    private String name;
    private int age;
    
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    @Id
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    
}

public class GirlPK implements Serializable {
    private static final long serialVersionUID = 1L;
    private int id;
    private String name;
    
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public boolean equal(Object obj){
        if(this == obj){
            return true;
        }
        if(obj != null && obj.getClass() == GirlPK.class){
            GirlPK target = (GirlPK)obj;
            if(target.getId() == getId() && target.getName().equals(getName())){
                return true;
            }
        }
        return false;
    }
    public int hashCode(){
        return getId()*7+getName().hashCode();
    }
    
    

public class Test {
    private static SessionFactory sessionFactory;
    private static ServiceRegistry serviceRegistry;

    public static void main(String[] args) {
        GirlPK gpk = new GirlPK();
        Girl g = new Girl();
        g.setAge(23);
        Configuration config = new Configuration().configure(); // 读取hibernate配置文件
        serviceRegistry = new ServiceRegistryBuilder().applySettings(
                config.getProperties()).buildServiceRegistry();
        sessionFactory = config.buildSessionFactory(serviceRegistry); // 创建SessionFactory

        Session session = sessionFactory.openSession();

        session.beginTransaction();
        session.save(g);
        session.flush();
        session.getTransaction().commit();

    }

}

 drop table Girl

    create table Girl (
        id int identity not null,
        name varchar(255) not null,
        age int not null,
        primary key (id, name)
    )