final AuthenticationContext context = new AuthenticationContext(authority, true, service);
            final Future<AuthenticationResult> future =
                    context.acquireTokenByRefreshToken(refreshToken, new ClientCredential(getClientId(), getClientSecret()), null, null);
            final AuthenticationResult result = future.get(acquisitionTimeout, TimeUnit.MILLISECONDS);
            if (result == null) {

import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;