Hi Frank,
> so the "proxy loader" loads only the interface
> with its values and not the whole classB
>
> is it possible to load dynamically all required classB elements
> and not only the interfaces ?
think you have to write an Interface for B class
too - e.g. interface BC extends C.
'proxy classes' base on declared interfaces, in your
case only on Interface C.
regards,
Armin
----- Original Message -----
From: "Frank Rub" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 25, 2003 2:22 PM
Subject: Problem using dynamic proxy for lazy loading
> Hi all,
>
> I have a Proxy loading problem:
>
> I have two classes "classA" and "classB"
> which do have a 1:n relation
>
> my repository
> <class-descriptor class="com.jmedia.map.entryForm.InterfaceC">
> <extent-class class-ref="com.jmedia.map.entryForm.ClassA" />
> <extent-class class-ref="com.jmedia.map.entryForm.ClassB" />
> </class-descriptor>
>
> <class-descriptor
> class="classA"
> table="A_Table"
> >
> ...
> ...
> <collection-descriptor
> name="ClassBCollection"
> element-class-ref="classB"
> auto-retreive="true"
> auto-update="true"
> auto-delete="true"
> orderby="id"
> sort="DESC"
> >
> <inverse-foreignkey field-ref="classAId"/>
> </collection-descriptor>
>
> </classDescriptior>
>
>
> <class-descriptor
> class="classB"
> proxy="dynamic"
> table="B_Table"
> >
> <field-descriptor
> name="classAId"
> column="classAId"
> jdbc-type="INTEGER"
> />
> ...
> ...
> </classDescriptior>
>
>
> my java code :-)
>
> interface interfaceC
> {
> get **
> set **
> }
>
> class classA extends interfaceC
> {
> get **
> set **
> Collection getClassBCollection();
> }
>
> class classB extends interfaceC
> {
> get **
> set **
> }
>
> because "class B" is about 30.000 times in "classA" collection
> for me it's important to use "lazy loading" because
> I only need about 100-500 items from "class B" at one time.
>
> and it works fine
> Collection myColl = classA.getClassBCollection();
>
> But if I try to get one Element, and try to cast it to "classB"
> classB myclassB = (classB)myColl.next();
> it throws a class cast exception
> only if I cast to the Interface (InterfaceC) everthing works fine
>
> so the "proxy loader" loads only the interface
> with its values and not the whole classB
>
> is it possible to load dynamically all required classB elements
> and not only the interfaces ?
>
>
> thank you in advance.
> Frank
>
>
>
>
>
>
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