The URL fetch interface uses a scalable service to fetch URLs, not direct
network connections.  The Java runtime supports using the URLConnection
interface to use this service.

There's probably a reason why the thread-related classes are on the
whitelist, though I don't know what it is.  Spawning threads is not allowed
by the sandbox.

-- Dan

On Thu, Apr 9, 2009 at 12:29 AM, JavaMiner <[email protected]>wrote:

>
> http://code.google.com/appengine/docs/java/overview.html
> "The JVM runs in a secured "sandbox" environment to isolate your
> application for service and security....For instance, an app cannot
> spawn threads...or make arbitrary network connections."
>
> http://code.google.com/appengine/docs/java/jrewhitelist.html
> java.lang.Thread
> java.util.concurrent.ThreadPoolExecutor
> java.util.concurrent.ScheduledThreadPoolExecutor
>
> Thread Pools are whitelisted.
>
> http://code.google.com/appengine/docs/quotas.html#UrlFetch
> You can fetch URLs from the App?
>
> >
>

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