Accessing Microsoft Graph Rest Services in Java using Web App Credentials in Azure Portal

Question

I am trying to access the following url via Microsoft Graph Api :- https://graph.microsoft.com/v1.0/me I have used the code given below found on stackoverflow which should ideally give me JSON. But I am getting exception while running the code :-

try {
            String url_str = "https://graph.microsoft.com/v1.0/me";
            String access_token = getAccessToken();

            url = new URL(url_str);
            con = ( HttpURLConnection )url.openConnection();
            con.setDoInput(true);
            con.setDoOutput(true);
            con.setUseCaches(false);
            con.setRequestMethod("GET");
            con.setRequestProperty("Authorization", access_token);
            con.setRequestProperty("Accept","application/json");
            con.connect();

            br = new BufferedReader(new InputStreamReader( con.getInputStream() ));
            String str = null;
            String line;
            while((line = br.readLine()) != null){
                str += line;
            }
            System.out.println(str);
        } catch (Exception e) {
            e.printStackTrace();
        }

I am getting valid access token. But I am getting following exception:-

java.io.FileNotFoundException: https://graph.microsoft.com/v1.0/me
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source)
    at com.controller.MicrosoftGraphController.getUserInfo(MicrosoftGraphController.java:50)
    at com.controller.MicrosoftGraphController.main(MicrosoftGraphController.java:82)

I tried searching but haven't found anything related to this particular issue. Any Suggestions? Thanks!

Possible duplicate of java.io.FileNotFoundException when I use Get Method in an HTTP Request — Marc LaFleur
– Marc LaFleur, Commented Feb 12, 2018 at 20:36
@MarcLaFleur-MSFT I am getting 404 response but still I am not able to figure out changes to be made in code to access the resource on server. — Batman22
– Batman22, Commented Feb 12, 2018 at 20:42
Can you add a capture of the HTTP traffic for this call? There should be a more detailed response than a simple 404 over the wire. — Marc LaFleur
– Marc LaFleur, Commented Feb 12, 2018 at 20:49
@MarcLaFleur-MSFT I am just debugging in eclipse... so i am not able to get any detailed response besides what I have mentioned. — Batman22
– Batman22, Commented Feb 12, 2018 at 20:58
You can use a tool like Fiddler or Wireshark to capture the traffic. Without seeing what is happening under the hood, it will be next to impossible to diagnose. — Marc LaFleur
– Marc LaFleur, Commented Feb 12, 2018 at 21:03

stdunbar · Accepted Answer · 2018-02-13 02:37:08Z

1

Change your code to be:

con.setRequestProperty("Authorization", "Bearer " + access_token);

You're using the OAuth2 protocol and it needs more than just the raw token. Note the space character after the word "Bearer" in the code.

Take a look at the docs for more detail.

answered Feb 13, 2018 at 2:37

stdunbar

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1 Comment

Batman22 Over a year ago

Thanks! I will post my answer and its something else that resolved my issue.

Caitlin Russell · Accepted Answer · 2018-02-13 01:27:13Z

0

Because the service is returning an error instead of a valid response, I believe you will have to handle this in your code manually:

int httpClientErrorResponseCode = 400;
InputStream response;

if (con.getResponseCode() >= httpClientErrorResponseCode) {
    response = con.getErrorStream();
} else {
    response = con.getInputStream();
}
// Stream response or handle error

answered Feb 13, 2018 at 1:27

Caitlin Russell

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Comments

Batman22 · Accepted Answer · 2018-02-14 16:09:47Z

0

After looking at my code. I realized as I have created web app in azure portal and I am using the app credentials to get authentication token. So the url that I was trying was related to the personal account "https://graph.microsoft.com/v1.0/me" but after trying "https://graph.microsoft.com/v1.0/users/" I was able to access the graph api's. Auth token has nothing to do with this.

answered Feb 14, 2018 at 16:09

Batman22

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2 Comments

Marc LaFleur Over a year ago

This isn't entirely correct, it is a token issue. The /me method works the same for both personal (MSA) and work/school accounts (AAD). What won't work however is signing in to a v1 App registered in the Azure Portal with an MSA. In order to use both MSA and AAD accounts, you need to created a Converged App registration at apps.dev.microsoft.com and use the v2 Endpoint.

Batman22 Over a year ago

@MarcLaFleur-MSFT Thanks!

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