If it helps, I built a java OAuth2 implementation a couple of months back, 
which works well and is reasonably self-contained. Feel free to have a look at 
the code here: 

https://github.com/Webreaper/PicasawebSync/tree/master/src/main/java/com/otway/picasasync/webclient
 
<https://github.com/Webreaper/PicasawebSync/tree/master/src/main/java/com/otway/picasasync/webclient>

On 1 Jun 2015, at 06:46, Gramps Gramps <[email protected]> wrote:

---------- Forwarded message ----------
From: 
Date: Jun 1, 2015 07:45
Subject: Re: [PWA API] Authenticating using OAuth 2 service account
To: <[email protected] 
<mailto:[email protected]>>
Cc: 

Hi Jim,

Have you already tried using the library?

Is there a "setOauth2..()" method available for the Picasawebservice class?

Could you let me know the URL from where you got it?

The google service APIs webpages are a mess, as far as usage of oAuth2 with its 
services...

PWA is the worse....the ClientLogin and oAuth1 APIs are deprecated, but somehow 
the jar files that I amusing still don't have the new setOAuth2 method for the 
any of the services...

Cheers,
Nuno

On Jun 1, 2015 03:23, "Jim McCabe" <[email protected] 
<mailto:[email protected]>> wrote:
It turns out there is a newer version of gdata-core-1.0.jar which does support 
OAuth 2.  Not sure why the version stayed 1.0 though.

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