使用Office 365邮件构建守护程序或服务应用程序抛出401错误代码

Question

我正在关注 http://blogs.msdn.com/b/exchangedev/archive/2015/01/22/building-demon-or-service-apps-with-office-365-mail-calendar-and-contacts-apis-oauth2-client-credential-flow.aspx

我正在编程以在Java中生成令牌。我从git中获取了AADL库。

而不是博客中为.net建议的代码我使用以下代码来代替java， String token = null;         String tenant =“my_tenant”;

    String authority = "https://login.windows.net/"+tenant+"/oauth2/authorize";
    ExecutorService service = null;
    service=Executors.newFixedThreadPool(1);
    try {
        AuthenticationContext authenticationContext =  new AuthenticationContext(authority, false, service);
        String certfile = "filapath/mycert.pfx";
        InputStream pkcs12Certificate=new FileInputStream(certfile);



        AsymmetricKeyCredential credential = AsymmetricKeyCredential.create("client_id", pkcs12Certificate,"password");
        System.out.println("X509 is fine!");

        Future<AuthenticationResult> future=authenticationContext.acquireToken("https://outlook.office365.com", credential, null);
        System.out.println("Token Received"+future.get().getAccessToken());
        token=future.get().getAccessToken();
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

但是当我使用令牌获取邮件REST APi时，这个过程得到了HTTP 401错误。 我在指定X509证书密钥时做错了什么？ 或其他什么？