May be this thread will help you:
http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/1b66b3901ec37a7f#

On 29 Jul., 17:13, Nuno <[email protected]> wrote:
> a class in the client sive can also be used in the server side...just make
> it implements Serializable and send it back to the server with the RPC
> services.
>
> Also note that as the classes in the client package are going to become
> javascript, they don't implement all of the JRE.
> That may be also a factor to know if you should put this on the client
> package.
>
> On Wed, Jul 29, 2009 at 12:07 PM, [email protected] <
>
>
>
> [email protected]> wrote:
>
> > Hi,
>
> > I'm experimenting with GWT for a couple of weeks now and ran into
> > another question.
>
> > The question relates where to put a certain class. Classes in the
> > client package are translated into javascript. Classes in the server
> > package are executed as java (I'm using App Engine too). Say I'm
> > building an app with a little game. I can write the game class at
> > client side so that that code can be run at the client, what seems to
> > be correct here. At the end of the game, the game should be persisted
> > into the datastore. So I make it persistence capable but than the
> > class is needed at the server side.
>
> > What should I do now? Put it at server side and use it at client side
> > too? In that case, the class needs to be inherited in the .gwt.xml,
> > no? Or should I build two seperate classes: just send the data of the
> > game to the server and build the data store element from that data to
> > store it?
>
> > Some advice would be appreciated :)
>
> > Maarten Decat
>
> --
> Quer aprender a programar? acompanhe:
> Wants to learn GWT? Follow this blog ->
>
> http://tcninja.blogspot.com
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