Hello @gguuss , thank you very much for sharing this straightforward example of Java Google+ authentication.

I notice in the instructions the developer will have to

1. Create the bin directory
2. Rename or copy client_secrets.json.example to client_secrets.json

In the spirit to make it simpler, why not create an empty bin directory, and simply name the client_secrets file as client_secrets.json ? Should be obvious enough for the developer to see YOUR_CLIENT_ID and YOUR_CLIENT_SECRET and replace it with the appropriate values.

The developer guide goes through quite a few more steps to verify the token than this sample app does.

The code there more closely resembles the gplus-verifytoken-java sample. But the README for that suggests those checks are important for tokens received from the client (and not via the one-time-code flow).

In my mind, it does not make sense that the code in the developer docs is issuing a second TokenInfo request to further verify the token. It seems every assertion they make against the result is already covered by a successful GoogleAuthorizationCodeTokenRequest.

When I tried the application clicking on the G+ button nothing happened. I turned on Firebug and I get this error message

TypeError: can't convert authResult[field] to primitive type

$('#authResult').append(' ' + field + ': ' + authResult[field] + '<br/>');

localhost:4567 (line 87)

For me the solution was to eliminate the output of the 'status' variable:
index.html lines 87-89

        if (field != 'status') {
          $('#authResult').append(' ' + field + ': ' + authResult[field] + '<br/>');
        }

I don't get the connections list when the main page loads. Javascript notifies me about a HTTP 500 problem. When I tried to access that page directly I get this message:

http://localhost:4567/people
HTTP ERROR: 500

Problem accessing /people. Reason:

com.google.api.client.auth.oauth2.Credential.<init>(Lcom/google/api/client/auth/oauth2/Credential$Builder;)V

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I'm trying out this sample, but I'm just getting:

400. That's an error.
     The page you requested is invalid. That's all we know.

I've configured a web application in Google Cloud Console, with an OAuth 2.0 Client ID, with web origin of http://localhost:4567.

in google play console i created the 1)productname "gplus-quickstart-java-master"
project name also "gplus-quickstart-java-master"
2)given the email id of mine
3)my client_secrets.json file details are below
Client ID: XXXXXXXXXXXXXXXX
Email address :XXXXXXXXXXXXXXXX
Client secret :XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Redirect URIs :http://localhost:8008/oauth2callback
Javascript Origins : http://localhost:8008
iam running on local host port number 8008

myerror dialog url when iam clicking on sign in button is below

https://accounts.google.com/o/oauth2/auth?client_id={{%20CLIENT_ID%20}}&redirect_uri=postmessage&response_type=code%20token%20id_token%20gsession&scope=https%3A%2F%2Fwww.googleapis.com%2Fauth%2Fplus.login&access_type=offline&request_visible_actions=http%3A%2F%2Fschemas.google.com%2FAddActivity&cookie_policy=single_host_origin&include_granted_scopes=true&proxy=oauth2relay503561546&origin=http%3A%2F%2Flocalhost%3A8008&state=467093370|0.3151933772&&e=3100077

what was my issue.any thing went wrong please help me