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Microsoft Authentication Library for Java gives you the ability to obtain tokens from Azure AD v2 (work and school accounts, MSA) and Azure AD B2C, gaining access to Microsoft Cloud API and any other API secured by Microsoft identities

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

package com.microsoft.aad.msal4j;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

class AcquireTokenByClientCredentialSupplier extends AuthenticationResultSupplier {

    private final static Logger LOG = LoggerFactory.getLogger(AcquireTokenByClientCredentialSupplier.class);
    private ClientCredentialRequest clientCredentialRequest;

    AcquireTokenByClientCredentialSupplier(ConfidentialClientApplication clientApplication,
                                           ClientCredentialRequest clientCredentialRequest) {
        super(clientApplication, clientCredentialRequest);
        this.clientCredentialRequest = clientCredentialRequest;
    }

    @Override
    AuthenticationResult execute() throws Exception {
        if (clientCredentialRequest.parameters.skipCache() != null &&
                !clientCredentialRequest.parameters.skipCache()) {
            LOG.debug("SkipCache set to false. Attempting cache lookup");
            try {
                SilentParameters parameters = SilentParameters
                        .builder(this.clientCredentialRequest.parameters.scopes())
                        .claims(this.clientCredentialRequest.parameters.claims())
                        .build();

                RequestContext context = new RequestContext(
                        this.clientApplication,
                        PublicApi.ACQUIRE_TOKEN_SILENTLY,
                        parameters);

                SilentRequest silentRequest = new SilentRequest(
                        parameters,
                        this.clientApplication,
                        context,
                        null);

                AcquireTokenSilentSupplier supplier = new AcquireTokenSilentSupplier(
                        this.clientApplication,
                        silentRequest);

                return supplier.execute();
            } catch (MsalClientException ex) {
                LOG.debug(String.format("Cache lookup failed: %s", ex.getMessage()));
                return acquireTokenByClientCredential();
            }
        }

        LOG.debug("SkipCache set to true. Skipping cache lookup and attempting client credentials request");
        return acquireTokenByClientCredential();
    }

    private AuthenticationResult acquireTokenByClientCredential() throws Exception {
        AcquireTokenByAuthorizationGrantSupplier supplier = new AcquireTokenByAuthorizationGrantSupplier(
                this.clientApplication,
                clientCredentialRequest,
                null);

        return supplier.execute();
    }
}