When employing the Remote API for Java for accessing another application's GAE datastore (as suggested here), do I have to use an admin password (as shown in sample code) or can I use service account credentials instead. Calls to the Remote API should originate in an App Engine Client, so non-password authentication seems to be the (only) sensible choice.
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Of course you can! It's as simple as that: RemoteApiOptions.useServiceAccountCredential
PS: You'll have to create a service account and download the key first. You have to grant the "AppEngine Admin"-role to the service account.

TomTasche
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