Hi!

I want to know if there is someway to set a many to one association type property at the client side(When the instance is

detached) to a new reference when I know the id of the new object to be referred.


If we take sample Auction Project example.


public class Bid extends Persistent implements Serializable{
private AuctionItem item;
private float amount;
private Date datetime;
private User bidder;

......

......
}



public Bid getBid(Long bidId){

Bid bid;

// takes the session form Session factor
// returns the bid
// closes the session

return bid; (This instance will be detached when it is tranferred to the client side while serialization)
}


public void saveBid(Bid bid){
// takes the session form Session factor
// Merge the bid object
// commit changes and closes the session
}



//Method at the clientside
public void updateBid() throws Exception {

Bid bid = auctionFacade.getBid(new Long(1)); //fetches the detached instance of Bid from Server Side

/* I want to update the Bidder of the Bid to a different User Instance whose ID is known.
(I understand that it does not make much business sense to update the bidder of the bid,
but I have a genuine case where I want to update the association between 2 objects in
exactly similar case).*/

/* The only way I can think of is getting the user instance from server as follows*/

User newUser=AuctionFacade.getUser(userId);

Bid.setUser(newUser);

/* this is not acceptable to me since it requires a server round trip. My client is actually
on a wan and I can not afford the performance loss due to this. I need to do something where I
can create a Proxy type thing of the user instance just on the basis of the userid.*/

bid.setUser(??) // What can I do here?

auctionFacade.saveBid(bid);

}



I hope the above explains my problem. Thanks in advance for the solution.