Of course not.
You can *present* datastore object in JSON (JavaScript Object
Notation).
Use POJO (Plain Old Java Object) concept while creating data Model of
your application.
You can easilly present list of Model objects in JSON, you can easilly
convert them from JSON to POJO on GWT (Java, client-side). The same
thing happens on server-side. Parse incomming JSON and construct Model
objects (in Python) using parsed data.

GWT+GAE can work together. Ofcourse, this way won't be productive
comparing to Java backend. But anyway, if you want to make good stable
complicated UI, don't use JS - it's paiful. Use OO Java and be happy
like I am ^)

On Mar 17, 4:57 pm, Amr Ellafi <[email protected]> wrote:
> Pavel,
> that's a good idea, you mean you can pass objects from the datastore
> to GWT via JSON ?
>
> On Tue, Mar 17, 2009 at 3:50 PM, Pavel Byles <[email protected]> wrote:
>
> > Coonay,
> > I use GWT and GAE together and I think it's a pretty good setup.
> > First, instead of using servlets you will use the request builder and
> > pass data using JSON instead. 2nd I effectively just send my HTML
> > output of my GWT project to my GAE project and configure my app.yaml
> > accordingly.
>
> > Using this method you will lose a really big part of GWT, which is the
> > debugging feature since you will be running dev_appserver. Unless you
> > can fix it such that u can get JSON responses from it.
>
> > But I like my setup. I have pydev and cypal both in eclipse. I just
> > wish i had debugging somehow.
>
> > On Mar 17, 5:36 am, Coonay <[email protected]> wrote:
> >> Gwt featurs really attractive:quickly build and maintain complex yet
> >> highly performant JavaScript front-end applications in the Java
> >> programming language,and Test your code with JUnit.The example mail
> >> page is really awesome.
>
> >> As a many years java progammmer,it's not hard to get into gwt,but the
> >> app engine is a different web environment,the static page can be
> >> served to browser directly,
> >> the hype link in the geranated html are needed to change accordingly.
>
> >> could you give me some idea how to make they 2 work together
> >> effective and productive?thanks so much
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