nullpointerexception - sincronizar - Obteniendo un error al acceder a la API del calendario de google. Excepción de puntero nulo

sincronizar calendario outlook android

Question

Aparece un mensaje de error a continuación ... cuando ejecuto el código para acceder a la API de Google Calendar. Hay un archivo client_secrets.json que tiene las credenciales (ID de cliente e ID de redirección). Descomprimí y ejecuté el paquete que google me dio, se ejecuta con éxito y pude verlo con el mensaje "Correcto, Agregar código aquí". después de lo cual me arroja una excepción de nullpointer para la cual no estoy seguro de qué fue lo que salió mal. Por favor, ayuda. Descargado el proyecto de ejemplo desde aquí https://developers.google.com/api-client-library/java/apis/calendar/v3

   May 01, 2014 12:59:42 PM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for everybody: C:/Users/Aishwarya Anand/.store/calendar_sample
May 01, 2014 12:59:42 PM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for owner: C:/Users/Aishwarya Anand/.store/calendar_sample
Success! Now add code here.
inserting event ...
Aish Event from the new Google API
2014-05-01T16:59:42.545Z
2014-05-01T17:59:42.545Z
java.lang.NullPointerException
    at com.google.api.client.repackaged.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:191)
    at com.google.api.client.util.Preconditions.checkNotNull(Preconditions.java:127)
    at com.google.api.client.json.jackson2.JacksonFactory.createJsonParser(JacksonFactory.java:96)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:85)
    at com.google.api.client.json.JsonObjectParser.parseAndClose(JsonObjectParser.java:81)
    at com.google.api.client.auth.oauth2.TokenResponseException.from(TokenResponseException.java:88)
    at com.google.api.client.auth.oauth2.TokenRequest.executeUnparsed(TokenRequest.java:287)
    at com.google.api.client.auth.oauth2.TokenRequest.execute(TokenRequest.java:307)
    at com.google.api.client.auth.oauth2.Credential.executeRefreshToken(Credential.java:570)
    at com.google.api.client.auth.oauth2.Credential.refreshToken(Credential.java:489)
    at com.google.api.client.auth.oauth2.Credential.intercept(Credential.java:217)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:859)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
    at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
    at com.google.api.services.samples.calendar.cmdline.CalendarSample.insertEventTest(CalendarSample.java:170)
    at com.google.api.services.samples.calendar.cmdline.CalendarSample.main(CalendarSample.java:116)

Clase aquí,

package com.google.api.services.samples.calendar.cmdline;
import com.google.api.client.auth.oauth2.Credential;
import com.google.api.client.extensions.java6.auth.oauth2.AuthorizationCodeInstalledApp;
import com.google.api.client.extensions.jetty.auth.oauth2.LocalServerReceiver;
import com.google.api.client.googleapis.auth.oauth2.GoogleAuthorizationCodeFlow;
import com.google.api.client.googleapis.auth.oauth2.GoogleClientSecrets;
import com.google.api.client.googleapis.javanet.GoogleNetHttpTransport;
import com.google.api.client.http.HttpTransport;
import com.google.api.client.json.JsonFactory;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.util.DateTime;
import com.google.api.client.util.store.DataStoreFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.calendar.Calendar;
import com.google.api.services.calendar.CalendarScopes;
import com.google.api.services.calendar.model.*;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Date;
import java.util.TimeZone;
public class CalendarSample {
    /**
   * Be sure to specify the name of your application. If the application name is {@code null} or
   * blank, the application will log a warning. Suggested format is "MyCompany-ProductName/1.0".
   */
  private static final String APPLICATION_NAME = "Caritas-CalendarAPI/1.0";

  /** Directory to store user credentials. */
  private static final java.io.File DATA_STORE_DIR =
      new java.io.File(System.getProperty("user.home"), ".store/calendar_sample");
/**
   * Global instance of the {@link DataStoreFactory}. The best practice is to make it a single
   * globally shared instance across your application.
   */
  private static FileDataStoreFactory dataStoreFactory;

  /** Global instance of the JSON factory. */
  private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

  /** Global instance of the HTTP transport. */
  private static HttpTransport httpTransport;

  @SuppressWarnings("unused")
  private static Calendar client;
/** Authorizes the installed application to access user''s protected data. */
  private static Credential authorize() throws Exception {
    // load client secrets
    GoogleClientSecrets clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,
        new InputStreamReader(CalendarSample.class.getResourceAsStream("/client_secrets.json")));

    // Set up authorization code flow.
    // Ask for only the permissions you need. Asking for more permissions will
    // reduce the number of users who finish the process for giving you access
    // to their accounts. It will also increase the amount of effort you will
    // have to spend explaining to users what you are doing with their data.
    // Here we are listing all of the available scopes. You should remove scopes
    // that you are not actually using.
    Set<String> scopes = new HashSet<String>();
    scopes.add(CalendarScopes.CALENDAR);
    scopes.add(CalendarScopes.CALENDAR_READONLY);

    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
        httpTransport, JSON_FACTORY, clientSecrets, scopes)
        .setDataStoreFactory(dataStoreFactory)
        .build();
    // authorize
    return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
  }

  public static void main(String[] args) {
    try {
      // initialize the transport
      httpTransport = GoogleNetHttpTransport.newTrustedTransport();

      // initialize the data store factory
      dataStoreFactory = new FileDataStoreFactory(DATA_STORE_DIR);

      // authorization
      Credential credential = authorize();

      // set up global Calendar instance
      client = new Calendar.Builder(httpTransport, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME).build();

      System.out.println("Success! Now add code here.");
      insertEventTest();

      //getEventList();
     //getEventTest();
      //sertEventTest();

    } catch (IOException e) {
      System.err.println(e.getMessage());
    } catch (Throwable t) {
      t.printStackTrace();
    }
    System.exit(1);
  }

  private static void getEventList() throws IOException {
      String pageToken = null;
      do {
        Events events = client.events().list("primary").setPageToken(pageToken).execute();
        List<Event> items = events.getItems();
        for (Event event : items) {
          System.out.println(" id: " + event.getId() + "; summary: " + event.getSummary());
        }
        pageToken = events.getNextPageToken();
      } while (pageToken != null);
  }

  private static void getEventTest() throws IOException {

      String eventId = "idkoi3c55lvegs2ev333u28grk5c";
      Event event = client.events().get("primary", eventId).execute();

      System.out.println(event.getSummary());     
  }

  private static void insertEventTest() throws IOException {

      System.out.println("inserting event ...");

      Event event = new Event();

      event.setSummary("Aish Event from the new Google API");
      event.setLocation("Somewhere");

     System.out.println(event.getSummary());

      Date startDate = new Date();
      Date endDate = new Date(startDate.getTime() + 3600000);
      DateTime start = new DateTime(startDate, TimeZone.getTimeZone("UTC"));
      event.setStart(new EventDateTime().setDateTime(start));
      System.out.println(start.toStringRfc3339());
      DateTime end = new DateTime(endDate, TimeZone.getTimeZone("UTC"));
      event.setEnd(new EventDateTime().setDateTime(end));
      System.out.println(end.toStringRfc3339());

      Event createdEvent = client.events().insert("primary", event).execute();


      System.out.println("event id" + createdEvent.getId());
  } 



 }