Is there any order for objects in a relationship collection

Question

I am using two cmp ejbs A and B which are in a many to one relationship.
This is like : Any Order has 0 to * OrderLines.
For this my ejb A has a cmr fild of type Collection:
public abstract Collection getBs();
public abstract void setBs(Collection x);
My question is if there is any way to indicate the position in which the related objects are saved in the collection.
This is very important for me. Because I want to generate a view to the
user for ejb A that should be allways in the same order.
This is like:
The view of the "order" should show the "orderLines" allways in the same positions: first orderline, 2nd orderline , 3rd orderlin,....
And if the user replace the 2nd "orderLine" with an other orderline, next time the view should still show it in the 2nd position in the "order" page.
If I use the following code:
Collection x = getBs();
x.add(someObject);
It won't be in any specific position.
I wanted to do the following:
Collection x = getBs();
Vector v = new Vector(x);
v[anyPosition] = someObject;
setBs(v);
But then I read that I should never use the set method for a cmr field of type Collection! Because this will be done exclusively by the container!
So what to do?????

Answer 1

Hi sarkarati,
As J2EE requires the usage of the Collection interface, the only way is to order the OrderLine by hand before display.
Regards,
-- markus.