Object conversions

[William Chu]

Hello,

I have changed the type of a field in an object I persist. For example:

class Foo {

     String someField;
     ....

}

to

class Foo {
   Integer someField;

}

How do I make a conversion from the old objects in the db to the new object structure? I am getting serialization errors when I retrieve or persist the object into the db.


I also know that xstream can do conversions, but I see that warp-persist is using Java's default input/output stream for serialization. Would the solution be to bind the serializer to xstream? If so, how do I do this?

Thanks for the help,
Will

[Dhanji R. Prasanna]

Hi,

What is the persistence layer you are using? You will have to consult the specific provider I'm afraid. Warp-persist does not do any serialization itself. So Hibernate/JPA/db4o is the right person to ask (depending on what you're using).

Dhanji.

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[will]

We're using JPA. I can't find a JPA community on the web where I can
ask my question. Do you know a forum or community I can ask? Thank you
for the help, Dhanji.

On Aug 13, 4:48 pm, "Dhanji R. Prasanna" <dha...@gmail.com> wrote:
> Hi,
>
> What is the persistence layer you are using? You will have to consult the
> specific provider I'm afraid. Warp-persist does not do any serialization
> itself. So Hibernate/JPA/db4o is the right person to ask (depending on what
> you're using).
>
> Dhanji.
>

> On Fri, Aug 13, 2010 at 12:41 PM, William Chu <will...@gmail.com> wrote:
> > Hello,
>
> > I have changed the type of a field in an object I persist. For example:
>
> > class Foo {
>
> >      String someField;
> >      ....
>
> > }
>
> > to
>
> > class Foo {
> >    Integer someField;
>
> > }
>
> > How do I make a conversion from the old objects in the db to the new object
> > structure? I am getting serialization errors when I retrieve or persist the
> > object into the db.
>
> > I also know that xstream can do conversions, but I see that warp-persist is
> > using Java's default input/output stream for serialization. Would the
> > solution be to bind the serializer to xstream? If so, how do I do this?
>
> > Thanks for the help,
> > Will
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "warp-core" group.
> > To post to this group, send email to warp...@googlegroups.com.
> > To unsubscribe from this group, send email to

> > warp-core+...@googlegroups.com<warp-core%2Bunsu...@googlegroups.com>
> > .

[Dhanji R. Prasanna]

There will typically be a JPA provider (JPA is just a spec). Look in your jar directories to see if it is hibernate or eclipselink or something like that? Then you can track down their forum easily.

Dhanji.

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