Re: Dynamic proxies and references Help

Jakob Braeuchi Fri, 04 Jul 2003 14:16:23 -0700

hi edson,

i also had a proxy having a reference to a proxy and it worked because of store. could you please post the stack trace of your problem ?

jakob

Edson Carlos Ericksson Richter wrote:

That was what I thinked... But what if my object contains a Collection of
proxies that should be updated too?
And that proxies has a (proxied) reference to the main object?

This is the reason I've to put that line...

See sample repository.xml:

 <class-descriptor
     class="br.com.mgr.beans.BeanA"
     proxy="dynamic"
     schema="MGR"
     table="TB_A">
   <field-descriptor
       name="id"
       column="ID"
       jdbc-type="VARCHAR"
       primarykey="true"
       autoincrement="false" />
   <field-descriptor
       name="description"
       column="DS"
       jdbc-type="VARCHAR" />
   <collection-descriptor
       name="allB"

collection-class="org.apache.ojb.broker.util.collections.RemovalAwareList"
       element-class-ref="br.com.mgr.beans.BeanA"
       proxy="true"
      auto-update="true"
       auto-delete="true">
      <orderby name="id" sort="DESC"/>
      <inverse-foreignkey
           field-ref="idA"/>
   </collection-descriptor>
 </class-descriptor>

 <class-descriptor
     class="br.com.mgr.beans.BeanB"
     proxy="dynamic"
     schema="MGR"
     table="TB_B">
   <field-descriptor
       name="idA"
       column="ID_A"
       jdbc-type="VARCHAR"
       primarykey="true"
       autoincrement="false" />
   <field-descriptor
       name="idB"
       column="ID_B"
       primarykey="true"
      jdbc-type="VARCHAR" />
   <field-descriptor
       name="value"
       column="VL"
       jdbc-type="DOUBLE" />
   <reference-descriptor
       name="a"
       proxy="true"
       class-ref="br.com.mgr.beans.BeanA">
     <foreignkey field-ref="idA"/>
   </reference-descriptor>
 </class-descriptor>


In this case, when assertFk is called, the beanB object is a proxy, that
cama from a collection proxy inside beanA, and beanA is not a proxy anymore.
This is the research I've done.

Maybe I'm wrong, but why my app works fine if I don't use proxies for the
collection? And why, when debugging, NetBeans shows that beanB in assertFk
IS a proxy? If the change I've done should not be there, then it should be
in other place - I don't know where. But it is needed. I'm using a
non-modified CVS HEAD obtained today (about 3 hours ago).

Please, double check it...

Edson Richter

----- Original Message ----- From: "Jakob Braeuchi" <[EMAIL PROTECTED]> To: "OJB Users List" <[EMAIL PROTECTED]> Sent: Friday, July 04, 2003 5:18 PM Subject: Re: Dynamic proxies and references Help

hi edson,

this may help, but afaik a proxy is always converted into a real object
before assertFkAssignment() is called.
see store()

           // ProxyObjects only have to be updated if their real
subjects have been loaded
           obj = ProxyHelper.getRealObjectIfMaterialized(obj);

jakob

Edson Carlos Ericksson Richter wrote:

I trying some advanced config in my app, and I've found same problem.

Appear

that AssertFkAssignment is missing converting Proxy to Objects.

I've tried to change the line

fld.getPersistentField().set(obj, refPkValues[i]);

to


fld.getPersistentField().set(ProxyHelper.getRealObject(obj),
refPkValues[i]);

in PersistenceBrokerImpl (line 737 in CVS HEAD). Now work for me, without
changing behaviour in rest of my app.

Jakob, Thomas, can you verify/confirm that? And if yes, can you fix this in
CVS?

Thanks,

Edson Richter

----- Original Message ----- From: "Marcus Breese" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, June 24, 2003 6:04 PM Subject: Dynamic proxies and references Help

Is it possible to have recursive references while using a dynamic proxy?

For example, I have a Project class where each project can track its
parent project.

The class is laid out as such:

Project
|- id
|- name
|- parentid
|- parentidObject

Project has an interface IProject.  Also, Id, Name and parentid are
inherited from a base class.

I can retrieve the Project fine via a dynamic proxy, but when I try to
get the parentIdObject, I get the following error:

13:52:49,838 - ERROR
org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefaultImpl -
while set field:
object class[ edu.iupui.cmg.labratj.om.Project
target field: parentIdObject
target field type: interface edu.iupui.cmg.labratj.om.IProject
object value class: $Proxy5
object value: Name: Test Project
Id: 1
PiId: 1
]

Can anyone see where I'm going wrong?

-=-= -=-= -=-= -=-= -=-= -=-= -=-= -=-= -=-= -=-= -=-=-
Marcus Breese                            [EMAIL PROTECTED]
IU School of Medicine              [EMAIL PROTECTED]
Dept. of Biochemistry and Molecular Biology
Center for Medical Genomics / Grow Lab


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Re: Dynamic proxies and references Help

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