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Quickstart: Acquire a token and call Microsoft Graph API from a Java console app using app's identity

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Quickstart: Acquire a token and call Microsoft Graph from a Java daemon app

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In this quickstart, you download and run a code sample that demonstrates how a Java application can get an access token using the app's identity to call the Microsoft Graph API and display a list of users in the directory. The code sample demonstrates how an unattended job or Windows service can run with an application identity, instead of a user's identity.

Prerequisites

To run this sample, you need:

Download and configure the quickstart app

Step 1: Configure the application in Azure portal

For the code sample for this quickstart to work, you need to create a client secret, and add Graph API's User.Read.All application permission.

Make these changes for me

Already configured Your application is configured with these attributes.

Step 2: Download the Java project

Download the code sample

Note

Enter_the_Supported_Account_Info_Here

If you try to run the application at this point, you'll receive HTTP 403 - Forbidden error: Insufficient privileges to complete the operation. This error happens because any app-only permission requires admin consent: A Cloud Application Administrator of your directory must give consent to your application. Select one of the options below depending on your role:

Cloud Application Administrator

If you're a Cloud Application Administrator of your tenant, go to API Permissions page select Grant admin consent for Enter_the_Tenant_Name_Here.

Standard user

If you're a standard user of your tenant, then you need to ask a Cloud Application Administrator to grant admin consent for your application. To do this, give the following URL to your administrator:

https://login.microsoftonline.com/Enter_the_Tenant_Id_Here/adminconsent?client_id=Enter_the_Application_Id_Here

Step 4: Run the application

You can test the sample directly by running the main method of ClientCredentialGrant.java from your IDE.

From your shell or command line:

$ mvn clean compile assembly:single

This will generate a msal-client-credential-secret-1.0.0.jar file in your /targets directory. Run this using your Java executable like below:

$ java -jar msal-client-credential-secret-1.0.0.jar

After running, the application should display the list of users in the configured tenant.

Important

This quickstart application uses a client secret to identify itself as confidential client. Because the client secret is added as a plain-text to your project files, for security reasons, it is recommended that you use a certificate instead of a client secret before considering the application as production application. For more information on how to use a certificate, see these instructions in the same GitHub repository for this sample, but in the second folder msal-client-credential-certificate.

More information

MSAL Java

MSAL Java is the library used to sign in users and request tokens used to access an API protected by Microsoft identity platform. As described, this quickstart requests tokens by using the application own identity instead of delegated permissions. The authentication flow used in this case is known as client credentials oauth flow. For more information on how to use MSAL Java with daemon apps, see this article.

Add MSAL4J to your application by using Maven or Gradle to manage your dependencies by making the following changes to the application's pom.xml (Maven) or build.gradle (Gradle) file.

In pom.xml:

<dependency>
    <groupId>com.microsoft.azure</groupId>
    <artifactId>msal4j</artifactId>
    <version>1.0.0</version>
</dependency>

In build.gradle:

compile group: 'com.microsoft.azure', name: 'msal4j', version: '1.0.0'

MSAL initialization

Add a reference to MSAL for Java by adding the following code to the top of the file where you will be using MSAL4J:

import com.microsoft.aad.msal4j.*;

Then, initialize MSAL using the following code:

IClientCredential credential = ClientCredentialFactory.createFromSecret(CLIENT_SECRET);

ConfidentialClientApplication cca =
        ConfidentialClientApplication
                .builder(CLIENT_ID, credential)
                .authority(AUTHORITY)
                .build();
Where: Description
CLIENT_SECRET Is the client secret created for the application in Azure portal.
CLIENT_ID Is the Application (client) ID for the application registered in the Azure portal. You can find this value in the app's Overview page in the Azure portal.
AUTHORITY The STS endpoint for user to authenticate. Usually https://login.microsoftonline.com/{tenant} for public cloud, where {tenant} is the name of your tenant or your tenant Id.

Requesting tokens

To request a token using app's identity, use acquireToken method:

IAuthenticationResult result;
     try {
         SilentParameters silentParameters =
                 SilentParameters
                         .builder(SCOPE)
                         .build();

         // try to acquire token silently. This call will fail since the token cache does not
         // have a token for the application you are requesting an access token for
         result = cca.acquireTokenSilently(silentParameters).join();
     } catch (Exception ex) {
         if (ex.getCause() instanceof MsalException) {

             ClientCredentialParameters parameters =
                     ClientCredentialParameters
                             .builder(SCOPE)
                             .build();

             // Try to acquire a token. If successful, you should see
             // the token information printed out to console
             result = cca.acquireToken(parameters).join();
         } else {
             // Handle other exceptions accordingly
             throw ex;
         }
     }
     return result;
Where: Description
SCOPE Contains the scopes requested. For confidential clients, this should use the format similar to {Application ID URI}/.default to indicate that the scopes being requested are the ones statically defined in the app object set in the Azure portal (for Microsoft Graph, {Application ID URI} points to https://graph.microsoft.com). For custom web APIs, {Application ID URI} is defined under the Expose an API section in App registrations in the Azure portal.

Help and support

If you need help, want to report an issue, or want to learn about your support options, see Help and support for developers.

Next steps

To learn more about daemon applications, see the scenario landing page.

Daemon application that calls web APIs