java preferences API on google app engine

From the java preferences API documentatio开发者_开发技巧n, I see this:

The data is stored persistently in an implementation-dependent backing store.

Is java.util.prefs available for use in GAE/J?

If so, does it use the datastore for persistence? Something else? Magic?

I've done the standard googling and such before asking this question, and couldn't find much. Any info is appreciated.

-tjw

No, since it is not on the whitelist