{
  "timestamp": "2020-01-27T19:47:34.274+0000",
  "status": 500,
  "error": "Internal Server Error",
  "message": "org.eclipse.jetty.server.Connector.setHost(Ljava/lang/String;)V",
  "path": "/"
}

  private Credential getCredentials(final NetHttpTransport HTTP_TRANSPORT) throws
      IOException {
    // Load client secrets.
    InputStream in = SheetCallAPI.class.getResourceAsStream(CREDENTIALS_FILE_PATH);
    if (in == null) {
      throw new FileNotFoundException("Resource not found: " + CREDENTIALS_FILE_PATH);
    }
   GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY, new InputStreamReader(in));

    // Build flow and trigger user authorization request.
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
        HTTP_TRANSPORT, JSON_FACTORY, clientSecrets, SCOPES)
        .setDataStoreFactory(new FileDataStoreFactory(new java.io.File(TOKENS_DIRECTORY_PATH)))
        .setAccessType("offline")
        .build();
    LocalServerReceiver receiver = new LocalServerReceiver.Builder().setPort(8080).build();
    return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");
  }

    return new AuthorizationCodeInstalledApp(flow, receiver).authorize("user");