执行Google Prediction API命令行示例时出错

时间：2014-06-24 08:43:55

标签： java eclipse nullpointerexception google-api google-prediction

我已经下载了预测api的示例命令行程序，并在eclipse中导入here。

我导入了该示例程序，并将client_secrets.json的内容替换为我从api控制台下载的文件值，如上面的链接所示。

我使用standalone explorer构建了模型。

但我希望通过我的java代码做预测。所以下面我提到了代码。

package com.google.api.services.samples.prediction.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.HttpResponse;
import com.google.api.client.http.HttpResponseException;
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.store.DataStoreFactory;
import com.google.api.client.util.store.FileDataStoreFactory;
import com.google.api.services.prediction.Prediction;
import com.google.api.services.prediction.PredictionScopes;
import com.google.api.services.prediction.model.Input;
import com.google.api.services.prediction.model.Input.InputInput;
import com.google.api.services.prediction.model.Output;
import com.google.api.services.prediction.model.Training;

import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Collections;

/**
 * @author Yaniv Inbar
 */
public class PredictionSample {

  /**
   * 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 = "senti-model/1.0";

  static final String MODEL_ID = "senti-model";
  //static final String STORAGE_DATA_LOCATION = "enter_bucket/language_id.txt";

  /** Directory to store user credentials. */
  private static final java.io.File DATA_STORE_DIR =
      new java.io.File(System.getProperty("user.home"), ".store/prediction_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 HTTP transport. */
  private static HttpTransport httpTransport;

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

  /** 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(PredictionSample.class.getResourceAsStream("/client_secrets.json")));
    if (clientSecrets.getDetails().getClientId().startsWith("Enter")
        || clientSecrets.getDetails().getClientSecret().startsWith("Enter ")) {
      System.out.println(
          "Enter Client ID and Secret from https://code.google.com/apis/console/?api=prediction "
          + "into prediction-cmdline-sample/src/main/resources/client_secrets.json");
      System.exit(1);
    }
    // set up authorization code flow
    GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
        httpTransport, JSON_FACTORY, clientSecrets,
        Collections.singleton(PredictionScopes.PREDICTION)).setDataStoreFactory(
        dataStoreFactory).build();
    // authorize
    return new AuthorizationCodeInstalledApp(flow, new LocalServerReceiver()).authorize("user");
  }

  private static void run() throws Exception {
    httpTransport = GoogleNetHttpTransport.newTrustedTransport();
    dataStoreFactory = new FileDataStoreFactory(DATA_STORE_DIR);
    // authorization
    Credential credential = authorize();
    Prediction prediction = new Prediction.Builder(
        httpTransport, JSON_FACTORY, credential).setApplicationName(APPLICATION_NAME).build();
    //train(prediction);
    predict(prediction, "Is this sentence in English?");
    predict(prediction, "¿Es esta frase en Español?");
    predict(prediction, "Est-ce cette phrase en Français?");
  }

   private static void error(String errorMessage) {
    System.err.println();
    System.err.println(errorMessage);
    System.exit(1);
  }

  private static void predict(Prediction prediction, String text) throws IOException {
    Input input = new Input();
    InputInput inputInput = new InputInput();
    inputInput.setCsvInstance(Collections.<Object>singletonList(text));
    input.setInput(inputInput);
    Output output = prediction.trainedmodels().predict(MODEL_ID, input).execute();
    System.out.println("Text: " + text);
    System.out.println("Predicted language: " + output.getOutputLabel());
  }

  public static void main(String[] args) {
    try {
      run();
      // success!
      return;
    } catch (IOException e) {
      System.err.println(e.getMessage());
    } catch (Throwable t) {
      t.printStackTrace();
    }
    System.exit(1);
  }
}

这是我在执行此代码时遇到的错误：

Jun 24, 2014 2:11:09 PM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for everybody: C:\Users\deepesh.shetty\.store\prediction_sample
Jun 24, 2014 2:11:09 PM com.google.api.client.util.store.FileDataStoreFactory setPermissionsToOwnerOnly
WARNING: unable to change permissions for owner: C:\Users\deepesh.shetty\.store\prediction_sample
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.prediction.cmdline.PredictionSample.predict(PredictionSample.java:157)
    at com.google.api.services.samples.prediction.cmdline.PredictionSample.run(PredictionSample.java:100)
    at com.google.api.services.samples.prediction.cmdline.PredictionSample.main(PredictionSample.java:164)

帮我解决问题。 谢谢。

2 个答案:

答案 0 :(得分：2)

... / JRE / LIB /安全/的java.policy

您可以尝试给予所有人以下的许可吗？

grant{
permission java.security.AllPermission;
};

答案 1 :(得分：0)

如果您使用client_secrets.json，则会在您的用户文件夹中创建一个小文件 - 在我的情况下为C:\Users\myUser\.store\calendar_sample，文件为 StoredCredential ，因此您可以删除这个文件并再次尝试该示例，这将有效，当您再次运行您的程序时，它会要求您再次为您的Google帐户授予权限。

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