what is mean mappedBy

[Samanthi perera]

this is from manning in Action in EJB 3 book

@Entity
public class Item {
@Id
protected Long itemId;
protected String title;
protected String description;
protected Date postdate;
...
@OneToMany(mappedBy="item")
protected Set<Bid> bids;
...
}
@Entity
public class Bid {
@Id
protected Long bidId;
protected Double amount;
protected Date timestamp;
...
@ManyToOne
protected Item item;
...
}

i am refering this line @OneToMany(mappedBy="item")
what is mean by here mappedBy="item" ?

[Mark Spritzler]

Please don't duplicate post the same question.

Thanks

Mark