当我尝试使用gmail API列出gmail线程时，我得到GoogleJsonResponseException：500内部服务器错误

Question

    private static final String USER = "[e-mail]";
    private static String emailAddress = "[e-mail]";
    {
       try {
              httpTransport = GoogleNetHttpTransport.newTrustedTransport();
              credential = new GoogleCredential.Builder()
              .setTransport(httpTransport)
              .setJsonFactory(JSON_FACTORY)
              .setServiceAccountId(emailAddress)
              .setServiceAccountPrivateKeyFromP12File(new File("myfile.p12"))
              .setServiceAccountScopes(Collections.singleton(GmailScopes.GMAIL_READONLY))
              .build();
          }
          catch (IOException | GeneralSecurityException e)
          {
              throw new RuntimeException(e);
          }
    }
    // Create a new authorized Gmail API client
    Gmail service = new Gmail.Builder(httpTransport, JSON_FACTORY, credential)
        .setApplicationName(APP_NAME).build();

    // Retrieve a page of Threads
    ListThreadsResponse threadsResponse = service.users().threads().list(USER).execute();
      List<Thread> threads = threadsResponse.getThreads();

   // Print ID of each Thread.
    for (Thread thread : threads) {
      System.out.println("Thread ID: " + thread.getId());

}

线程“main”com.google.api.client.googleapis.json.GoogleJsonResponseException中出现异常：500内部服务器错误。

{“code”：500,“errors”：[{“domain”：“global”,“message”：“backend error”,“reason”：“backend error”}],“message”：“backend error”}在com.google.api.client.Googleapis.json.GoogleJsonResponseException.from（GoogleJsonResponseException.from：145）在com.google.api.client.Googleapis.services.json.abstractGoogleJsonClientRequest.NewExceptiononError（abstractGoogleJsonClientRequest.java:113)在AbstractGoogleJsonClientRequest.java:40)在com.google.api.client.googleapis.services.AbstractGoogleClientRequest.java:1。InterceptResponse（AbstractGoogleClientRequest.java:312)在com.google.api.client.http.HttpRequest.execute（httpRequest.java:1049)在com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed（AbstractGoogleClientRequest.java:410)在com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed（tcom.google.api.client.googleapis.services.abstractGoogleClientRequest.execute（abstractGoogleClientRequest.java:460)在core.crescent.gmail.gmailapiquickstart.main（gmailapiquickstart.java:192)

Answer 1

所以我找到了问题并修复了它！

当设置“凭据”时（在我上面发布的代码中）。我需要添加.setServiceAccountUser（USER）子例程。通过这样做，您在创建的服务帐户和您想要访问的GMAIL帐户之间建立了链接。我以前在https://developers.google.com/accounts/docs/oauth2ServiceAccount中看到过它，但我的印象是，只有当您想要链接到不同域名下的帐户时才会这样做。

这解决了我的问题。谢谢大家的回复