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 If you're following the how-to article on unit testing ( http://code.google.com/appengine/docs/java/howto/unittesting.html) you'll need to update your TestEnvironment class to look like this one: http://code.google.com/p/datanucleus-appengine/source/browse/branches... (lines 34 - 66) We're working on getting the docs updated right now.

it could be implemented as follows: The developer creates a CName record from *.<developersAppSubDomain>.<developersDomain>.com to <appEngineAppId>.appspot.com (if wildcard CName values aren't available on the developer's DNS server, then the developer will have to create one entry per customer). When Google receives a request on the App Engine Server with an unknown host name such as <subdomain>.<customersDomain>.com, it does the CName look-up, until it finds a host name of the form <appEngineAppId>.appspot.com. It then sends the server request on to that App Engine application, ideally including the whole CName "chain" as a special CGI variable, so that the application can determine the user ID of the customer that owns the domain. (And if the App Engine server doesn't find a host name for an App Engine application, it returns 404.)