As far as I know you can use some workarounds:

*Use OpenID as an authentication option and accept as many providers
you can (usually Gmail, Google Apps, Facebook, Yahoo are used). This
will enlarge your user base.
*Just leave a demo page out of security constraint: you can serve
content to users who did non authenticate, simply adjust the URLs you
set as protected in your web.xml
*Write your custom User model, a subscription form and a basic
authentication check. I'm trying to avoid this, since it exposes to
possible failures.

I think for your use case the best thing would be to simply leave open
access to users.

Regards
Lorenzo

On Nov 2, 2:41 pm, Zeynel <azeyn...@gmail.com> wrote:
> Hello,
>
> I am reading the Users Service before I deploy my app. I was wondering
> if you can explain if it is possible for a user to choose a nickname
> and start using the app without logging in with Google account. All I
> need to do is to write the user input to datastore and retrieve it.
> The point is to let users try the app without logging in. Thanks for
> any advice.

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