public class  Me {

    private Long id;
    private String username;                         
    private Car mycar = new Car();

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }


@Transient
    public Car getMycar() {
        return mycar;
    }

    public void setMycar(Car mycar) {
        this.mycar = mycar;
    }
}

public class Car {
    private Long id;
    private String model;
    private String mileage;
    private String cost;

   Assuming all the getter and setters are already coded....
}

public List<Me> findCars(String username, String cost) {
   getHibernateTemplate().find("from Me as m where m.username='"+username+"' and m.mycar.cost='"+cost+"'");
}

could not resolve property: mycar of: com.app.model.Me [from com.app.model.Me as m where m.username='jack' and m.mycar.cost='40000']; nested exception is org.hibernate.QueryException: could not resolve property: mycar of: com.app.model.Me [from com.app.model.Me as m where m.username='jack' and m.mycar.cost='40000']

transient properties are neither persisted nor queryable.