blob to shoppingcart issue

Hello list,

I have some rather disturbing issues when reading a stored shoppingcart 
object from the database. First of all, here is the entity definition:

<entity entity-name="ShoppingSession"
package-name="de.comp.order"
title="Shopping Session Store">
<field name="userLoginId" type="id-vlong-ne"></field>
<field name="shoppingSession" type="blob"></field>
<field name="isValid" type="indicator"></field>
<prim-key field="userLoginId"/>
<relation type="one" rel-entity-name="UserLogin">
<key-map field-name="userLoginId"/>
</relation>
</entity>

As you can see, I'm storing the shoppingcart as a blob. Here's how I write 
the object to the database:
...
shoppingSession.set("shoppingSession", UtilObject.getBytes(cart));
shoppingSession.set("isValid", "Y");
delegator.createOrStore(shoppingSession);

Next, I try to read the shoppingcart from the database:
ShoppingCart savedCart = (ShoppingCart) shoppingSession.get(
"shoppingSession");

On my windows development machine everything works fine. The shoppingcart 
object is created properly and everybody's happy :-)
On my linux server machine on the other hand the above line throws a 
ClassCastException saying that it cannot cast a SerialBlob to a 
ShoppingCart.

I did a bit of research and found something that  me. In the 
getValue() method in SqlJdbcUtil there's a call to deserializeField() on 
line 576. The call in.readObject() in line 683 in this method returns a 
WebShoppingCart on my development machine, but it returns null on my 
server. What is happening here? Any help is greatly appreciated.

Cheers,
Daniel


Daniel Rosowski
Consultant AEW
Agrenon GmbH
Johanniskirchplatz 6
33615 Bielefeld
Deutschland
Fon: +49 521 5247-413
Fax: +49 521 5247-250
Mobil: +49 170 381 5757


Company and Management Headquarters:
Agrenon GmbH, Johanniskirchplatz 6, 33615 Bielefeld, Deutschland, Fon: +49 521 5247-0, 
Fax: +49 521 5247-250, www.agrenon.com

Court Registration: Amtsgericht Bielefeld HRB 36795
Chief Executive Officer: Dirk Osterkamp

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Besuchen Sie uns!

live@lynx: 
Releasewechsel SAP BI 7.0 &
Produktroadmap SAP

19. Juni 2008
Beginn: 15.00 Uhr
Geschäftsstelle Bielefeld

is there a reason you are not using the store shoppingcart service?

Daniel Rosowski sent the following on 6/11/2008 9:16 AM:
> Hello list,
>=20
> I have some rather disturbing issues when reading a stored shoppingcart=
=20
> object from the database. First of all, here is the entity definition:
>=20
> <entity entity-name=3D"ShoppingSession"
>             package-name=3D"de.comp.order"
>             title=3D"Shopping Session Store">
> <field name=3D"userLoginId" type=3D"id-vlong-ne"></field>
> <field name=3D"shoppingSession" type=3D"blob"></field>
> <field name=3D"isValid" type=3D"indicator"></field>
> <prim-key field=3D"userLoginId"/>
> <relation type=3D"one" rel-entity-name=3D"UserLogin">
>         <key-map field-name=3D"userLoginId"/>
> </relation>
> </entity>
>=20
> As you can see, I'm storing the shoppingcart as a blob. Here's how I wr=
ite=20
> the object to the database:
> ...
> shoppingSession.set("shoppingSession", UtilObject.getBytes(cart));
> shoppingSession.set("isValid", "Y");
> delegator.createOrStore(shoppingSession);
>=20
> Next, I try to read the shoppingcart from the database:
> ShoppingCart savedCart =3D (ShoppingCart) shoppingSession.get(
> "shoppingSession");
>=20
> On my windows development machine everything works fine. The shoppingca=
rt=20
> object is created properly and everybody's happy :-)
> On my linux server machine on the other hand the above line throws a=20
> ClassCastException saying that it cannot cast a SerialBlob to a=20
> ShoppingCart.
>=20
> I did a bit of research and found something that  me. In the=20
> getValue() method in SqlJdbcUtil there's a call to deserializeField() o=
n=20
> line 576. The call in.readObject() in line 683 in this method returns a=
=20
> WebShoppingCart on my development machine, but it returns null on my=20
> server. What is happening here? Any help is greatly appreciated.
>=20
> Cheers,
> Daniel
>=20
>=20
> Daniel Rosowski
> Consultant AEW
> Agrenon GmbH
> Johanniskirchplatz 6
> 33615 Bielefeld
> Deutschland
> Fon: +49 521 5247-413
> Fax: +49 521 5247-250
> Mobil: +49 170 381 5757
>=20
>=20
> Company and Management Headquarters:
> Agrenon GmbH, Johanniskirchplatz 6, 33615 Bielefeld, Deutschland, Fon: =
+49 521 5247-0, Fax: +49 521 5247-250, www.agrenon.com
>=20
> Court Registration: Amtsgericht Bielefeld HRB 36795
> Chief Executive Officer: Dirk Osterkamp
>=20
> -----------------------------------------------------------------------=
-----------------------------
> This e-mail may contain trade secrets or privileged, undisclosed, or ot=
herwise confidential information. If you have received this e-mail in err=
or, you are hereby notified that any review, copying, or distribution of =
it is strictly prohibited. Please inform us immediately and destroy the o=
riginal transmittal. Thank you for your cooperation.=20
> -----------------------------------------------------------------------=
-----------------------------
>=20
>=20
> Besuchen Sie uns!
>=20
> live@lynx:=20
> Releasewechsel SAP BI 7.0 &
> Produktroadmap SAP
>=20
> 19. Juni 2008
> Beginn: 15.00 Uhr
> Gesch=C3=A4ftsstelle Bielefeld