Re: Problem using strongly typed collections

[Larry V. Streepy, Jr.]

I know that it may have just been omitted from your example data model, 
but do you have a
   public void setBs( Collection )
method in A?

Guillaume Nodet wrote:

The problem is the object model cannot be modified.

-----Message d'origine-----
De : Thomas Mahler [mailto:[EMAIL PROTECTED]
Envoye : mardi 13 janvier 2004 17:41
A : OJB Users List
Objet : Re: Problem using strongly typed collections
Hi Guilaume,

Guillaume Nodet wrote:
 

I've got an object model with strongly typed collections:

        class A {
                private BList bs;
                public  BList getBs();
        }
        class B {
                ...
        }
        class BList implements Collection {
                ...
        }
When I store the object, everything is good, but when i read it later i've
got an exception
thrown from AbstractPersistentField.set when trying to set the B
   

collection,
 

which is a
ManageableCollection.
   

IMO the is caused by the fact that you Blist attribute is now filled
with a ManeageableCollection and not with BList!
You have to tell in the collection-descriptor that the "bs" attribute
must use a special collection-class="BList".
To make this work You BList must implement the interface
o.a.ojb.broker.ManageableCollection.
See tutorial 3 for more details.

 

OJB was configured to use
PersistentFieldDirectAccessImpl.
So i tried with PersistentFieldIntrospectorImpl and adding a set method
        public void setBs(Collection list)
but I've got the following exception:
        Can't get WriteMethod for property:bs in object:A
Is there a way to store and read my collection without writing a custom
PersistentField ?
   

IMO this is only a secondary error!

cheers,
thomas
 

Guillaume Nodet



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--
Larry V. Streepy, Jr.
Senior Vice President and CTO
Health Language, Inc.