I'll try to do show in a sample:
public class TestA {
public int idA;
public java.util.List allB;
}
public class TestB {
public int idB;
public int idReferenceToA;
public TestA referenceToA;
}
in XML:
<class-descriptor
class="TestA"
proxy="dynamic"
table="TB_A">
<field-descriptor
name="idA"
column="ID_A"
primarykey="true"
jdbc-type="Integer"/>
<collection-descriptor
name="allB"
collection-class="org.apache.ojb.broker.util.collections.ManageableArrayList"
element-class-ref="TestB"
proxy="true"
auto-update="false"
auto-delete="false"/>
<inverse-foreignkey
field-ref="idReferenceToA"/>
</collection-descriptor>
</class-descriptor>
<class-descriptor
class="TestB"
proxy="dynamic"
table="TB_B">
<field-descriptor
name="idB"
column="ID_B"
primarykey="true"
jdbc-type="Integer"/>
<field-descriptor
name="idReferenceToA"
column="ID_A"
primarykey="true"
jdbc-type="Integer"/>
<reference-descriptor
name="referenceToA"
proxy="true"
class-ref="TestA">
<foreignkey field-ref="idReferenceToA"/>
</reference-descriptor>
</class-descriptor>
I get this sample from my projects (just changed the field/table/bean names, and
simplified the beans). This works fine (may be I made some typo when changing names,
so this sample could/couldn't run as is). But the main ideia is there.
If you are using JavaBeans like acessors (like I do), don't forget to implement
getter/setters for your objects.
Best regards,
Edson Richter
----- Original Message -----
From: Mauricio Montblanch
To: OJB Users List
Sent: Tuesday, March 23, 2004 3:16 PM
Subject: Re: Newbie Proxy problem
Nop, it did not work, have you any example ????????????
Edson Carlos Ericksson Richter wrote:
>As far as you have explained, you should not get ClassCastException.
>First let's go analize your code:
>
>1) Product implements InterfaceProduct.
>2) ProductGroup have a products list. Ok, have you set the collection-class in the
collection-descriptor to ManageableArrayList? If you have not, do it, because default
is RemovalAwareCollection (you can't make cast from Collection to List, or you will
get ClassCastException).
>
>Without more details is hard to give you better ideais about what's can be going
wrong.
>
>Best regards,
>
>Edson Richter
>
> ----- Original Message -----
> From: Mauricio Montblanch
> To: OJB Users List
> Sent: Friday, March 19, 2004 11:54 AM
> Subject: Newbie Proxy problem
>
>
> Hi I am trying to use a dynamic proxy in a 1:n relation (loading a list)
> but a I can 't figure out how make it work (I get a
> java.lang.ClassCastException when I try to get the any object), can
> anyone give me a simple example of how to use a dynamic proxy.
>
> Detail
>
> Clases:
>
> Product
> InterfaceProduct (Interface)
> ProductGroup (contains List products)
>
> XML:
> <class-descriptor class="Product" proxy="dynamic" table="PRODUCT">
> ..............
> <class-descriptor class="ProductGroup" table="PRODUCTGROUP">
> .....
> .....
> <collection-descriptor name="products" element-class-ref="Product">
> <inverse-foreignkey field-ref="idProductGroup"/>
> </collection-descriptor>
>
> so, when y get a product Group y get a list of products filled with
> objects of the type (InterfaceProduct)
>
> and I can say
>
> InterfaceProduct i=(InterfaceProduct) ptoducts.get(0);
> without errors
>
> but how I can materialize the Product Object ????????
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
>
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.624 / Virus Database: 401 - Release Date: 15/3/2004
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.637 / Virus Database: 408 - Release Date: 20/3/2004
