Running both python and java runtimes (under different version
strings) is an intriguing idea.

Is it possible to have both the python and java local dev appservers
to use the same local datastore?

(If not, it seems difficult to properly test the apps.)

Are there any other specific worms in this can anyone can think of?

On Nov 10, 6:51 pm, "Ikai L (Google)" <ika...@google.com> wrote:
> You won't be able to have direct access to the same datastore from both
> applications, however, you can write both a Python and Java application
> running with the same appspot 
> ID:http://googleappengine.blogspot.com/2009/06/10-things-you-probably-di....
> In
> general, though, if you use this approach, you'd probably opening a can of
> worms.
>
> A better approach if you absolutely need to write your application using two
> languages is to have two applications, with one application using URLFetch
> APIs to post to the application hosting the authoritative data store. Is
> there a reason you need to write your application in both Java and Python?
> It may be simpler just to write the entire application in a single language,
> but even then there is another option: running any JVM version of a
> language. The community has been successful running Scala, Jython, JRuby,
> Groovy amongst other languages on the Java flavor of App Engine in
> conjunction with Java (though there are some caveats).
>
> As far as SLAs go, we do not have any SLAs for applications running on App
> Engine.
>
>
>
> On Tue, Nov 10, 2009 at 3:19 PM, geniesis <geniesis...@gmail.com> wrote:
>
> > My eventual solution/implmentation will consist of two apps.
>
> > The first app is the web-frontend which provides the user interface
> > and eye-candy for users to view data in the datastore.
>
> > The second app is mainly for the backend support software. There will
> > be a bunch of servers that will be periodically posting data to this
> > second app. The second app will process this data and store it in the
> > datastore.
>
> > The issue here is, can the two apps share a common datastore?? Or does
> > it need to all exist in the one app.
>
> > I ask this because the frontend will more than likely be in java, but
> > the backend app will be in python.
>
> > Considering you can only have 1 lang running at any one time on an
> > app, this because an issue.
>
> > Also, are there SLA's on App Engine?
>
> --
> Ikai Lan
> Developer Programs Engineer, Google App Engine

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