I have the following two classes. I want the order to contain a list with orderlines. My question is how I make a mapping such that I automatically can retrive the orderlines when I get the order object. And visa verca, if I build up a object with order and a list with orderlines, how do I make the mapping such that when I save the order object, I also save the orderline list in that object.

@Entity
@Table (name="supplierorder")
public class SupplierOrder {

@Id
@Column(name = "id")
private int id;

@Column(name = "date")
private Date orderdate;

private List<SupplierOrderLine> orderlines;

--getters and setters
}

@Entity
@Table (name="supplierorderline")
public class SupplierOrderLine implements Serializable{

@Id
@Column(name = "id")
private int id;

@ManyToOne
@JoinColumn(name="fruit_id")
private Fruit fruit;

@ManyToOne
@JoinColumn(name="supplier_id")
private Supplier supplier;

@Column(name = "number")
private Integer number;

@Column(name = "kiloprice")
private Double kiloprice;

...getters and setters
}