Getting an exception when tried to implement Azure AD authentication using java

Question

I am using the Username-Password Flow to acquire the token. Below is my sample code:

public class UsernamePasswordFlowTest {

private static String authority;
private static Set scope;
private static String clientId;
private static String username;
private static String password;
public static void main(String args[]) throws Exception {

    setUpSampleData();

    PublicClientApplication pca = PublicClientApplication.builder(clientId)
            .authority(authority)
            .build();

    //Get list of accounts from the application's token cache, and search them for the configured username
    //getAccounts() will be empty on this first call, as accounts are added to the cache when acquiring a token
    Set accountsInCache = pca.getAccounts().join();
    IAccount account = getAccountByUsername(accountsInCache, username);

    //Attempt to acquire token when user's account is not in the application's token cache
    IAuthenticationResult result = acquireTokenUsernamePassword(pca, scope, account, username, password);
    System.out.println("Account username: " + result.account().username());
    System.out.println("Access token:     " + result.accessToken());
    System.out.println("Id token:         " + result.idToken());
    System.out.println();

    accountsInCache = pca.getAccounts().join();
    account = getAccountByUsername(accountsInCache, username);

    //Attempt to acquire token again, now that the user's account and a token are in the application's token cache
    result = acquireTokenUsernamePassword(pca, scope, account, username, password);
    System.out.println("Account username: " + result.account().username());
    System.out.println("Access token:     " + result.accessToken());
    System.out.println("Id token:         " + result.idToken());
}

private static IAuthenticationResult acquireTokenUsernamePassword(PublicClientApplication pca,
                                                                  Set scope,
                                                                  IAccount account,
                                                                  String username,
                                                                  String password) throws Exception {
    IAuthenticationResult result;
    try {
        SilentParameters silentParameters =
                SilentParameters
                        .builder(scope)
                        .account(account)
                        .build();
        // Try to acquire token silently. This will fail on the first acquireTokenUsernamePassword() call
        // because the token cache does not have any data for the user you are trying to acquire a token for
        result = pca.acquireTokenSilently(silentParameters).join();
        System.out.println("==acquireTokenSilently call succeeded");
    } catch (Exception ex) {
        if (ex.getCause() instanceof MsalException) {
            System.out.println("==acquireTokenSilently call failed: " + ex.getCause());
            UserNamePasswordParameters parameters =
                    UserNamePasswordParameters
                            .builder(scope, username, password.toCharArray())
                            .build();
            // Try to acquire a token via username/password. If successful, you should see
            // the token and account information printed out to console
            result = pca.acquireToken(parameters).join();
            System.out.println("==username/password flow succeeded");
        } else {
            // Handle other exceptions accordingly
            throw ex;
        }
    }
    return result;
}

/**
 * Helper function to return an account from a given set of accounts based on the given username,
 * or return null if no accounts in the set match
 */
private static IAccount getAccountByUsername(Set accounts, String username) {
    if (accounts.isEmpty()) {
        System.out.println("==No accounts in cache");
    } else {
        System.out.println("==Accounts in cache: " + accounts.size());
        for (IAccount account : accounts) {
            if (account.username().equals(username)) {
                return account;
            }
        }
    }
    return null;
}

/**
 * Helper function unique to this sample setting. In a real application these wouldn't be so hardcoded, for example
 * values such as username/password would come from the user, and different users may require different scopes
 */
private static void setUpSampleData() throws IOException {
    authority = "https://login.microsoftonline.com/{tenantId}"; // tenantid = xxxxxxxx
    scope = Collections.singleton("user.read");
    clientId = "ebxxxx1c-e1xxx-4xxx-bxxx-dxxxxeaxxxx";
    username = "testuser";
    password = "xxxx";
}

}

But getting exception :

com.microsoft.aad.msal4j.MsalClientException: Token not found in the cache at com.microsoft.aad.msal4j.AcquireTokenSilentSupplier.execute(AcquireTokenSilentSupplier.java:98) at com.microsoft.aad.msal4j.AuthenticationResultSupplier.get(AuthenticationResultSupplier.java:59) at com.microsoft.aad.msal4j.AuthenticationResultSupplier.get(AuthenticationResultSupplier.java:17) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1700)

Caused by: com.microsoft.aad.msal4j.MsalServiceException: Unknown service exception. Http request returned status code 404 with no response body at com.microsoft.aad.msal4j.MsalServiceExceptionFactory.fromHttpResponse(MsalServiceExceptionFactory.java:52) at com.microsoft.aad.msal4j.UserDiscoveryRequest.execute(UserDiscoveryRequest.java:34) at com.microsoft.aad.msal4j.AcquireTokenByAuthorizationGrantSupplier.processPasswordGrant(AcquireTokenByAuthorizationGrantSupplier.java:91)

Can someone help me to understand this exception?

Getting an exception when tried to implement Azure AD authentication using java

Answers (1)

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