Hi,

You have to authenticate each of your users on GAEJ via UserService
using the Google login service and then you should be able to access
the Spreadsheets through this login.
See http://code.google.com/appengine/docs/java/users/overview.html

Do you use GWT for your front-end?
If yes, see 
http://code.google.com/webtoolkit/doc/1.6/tutorial/appengine.html#user
for a good tutorial on how t implement.

regards
didier

On Dec 3, 10:33 am, Guy Bobenrieth <guy.bobenri...@gmail.com> wrote:
> Dear reader,
>
> I need some advise on the way to achieve this. My web application is
> hosted on GAEJ. As users are using it, data are produced. These data
> are stored  inside the database, using jdo. I want too to write/update
> some of these data inside a Google spreadsheet.
>
> I saw the Google spreadsheet API and Google List doc.
>
> What I'm unsure is about the authentication procedure to follow.
>
> Will have my web application direct access to the Google docs
> associated to my account, once running inside GAEJ, or should I do an
> authentication before ?
>
> In this case which one should I prefer, I think about  the
> ClientLogin ...
>
> Are there some examples about this somewhere ?
>
> Thanks for your work and help
>
> Guy

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