java.lang.NoClassDefFoundError: com/google/appengine/api/urlfetch/HTTPMethod

Question

我正在嘗試按照以下方式使用后端服務器驗證 Google ID 令牌：

https://developers.google.com/identity/sign-in/android/backend-auth

令牌最初由 android 應用程序檢索，然后通過嘗試驗證的套接字傳遞到后端登錄服務器。 就目前情況而言，在我導入的 GoogleIdTokenVerifier 代碼中在運行時拋出了一個錯誤。

服務器線程.java：

GoogleIdToken idToken = GoogleAuthenticator.authenticateToken(tokenJson.getToken());

GoogleAuthenticator.java：

import java.io.IOException;
import java.security.GeneralSecurityException;
import java.util.Collections;
import java.util.Properties;

import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.client.extensions.appengine.http.UrlFetchTransport;

public class GoogleAuthenticator {

    public GoogleAuthenticator(){

    }

    public static Properties prop;

    public static GoogleIdToken authenticateToken(String inputToken) throws IOException{

    final JacksonFactory jacksonFactory = new JacksonFactory();
    prop = new Properties();
    prop.load(GoogleAuthenticator.class.getClassLoader().getResourceAsStream("config.properties"));

    GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(UrlFetchTransport.getDefaultInstance(), jacksonFactory)
            // Specify the CLIENT_ID of the app that accesses the backend:
            .setAudience(Collections.singletonList(prop.getProperty("google.web.client.id")))
            // Or, if multiple clients access the backend:
            //.setAudience(Arrays.asList(CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3))
            .build();

        GoogleIdToken idToken;
        try {
            idToken = verifier.verify(inputToken);
            return idToken;
        } catch (GeneralSecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return null;
        }
    }
}

pom.xml

    <dependency>
        <groupId>com.google.api-client</groupId>
        <artifactId>google-api-client</artifactId>
        <version>1.25.0</version>
   </dependency>

   <dependency>
        <groupId>com.google.api-client</groupId>
        <artifactId>google-api-client-appengine</artifactId>
        <version>1.25.0</version>
   </dependency>

我目前看到以下堆棧跟蹤：

Exception in thread "Thread-0" java.lang.NoClassDefFoundError: com/google/appengine/api/urlfetch/HTTPMethod
    at com.google.api.client.extensions.appengine.http.UrlFetchTransport.buildRequest(UrlFetchTransport.java:118)
    at com.google.api.client.extensions.appengine.http.UrlFetchTransport.buildRequest(UrlFetchTransport.java:50)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:872)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.refresh(GooglePublicKeysManager.java:172)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.getPublicKeys(GooglePublicKeysManager.java:140)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:174)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:192)
    at com.omarhegazi.login.GoogleAuthenticator.authenticateToken(GoogleAuthenticator.java:40)
    at com.omarhegazi.login.ServerThread.run(ServerThread.java:45)

看起來依賴項中沒有可用的 HTTPMethod 類。 有什么想法嗎？

更新1：

添加下面的 appengine 依賴項已經取得了一些進展。 我現在有以下堆棧跟蹤錯誤：

Exception in thread "Thread-0" com.google.apphosting.api.ApiProxy$CallNotFoundException: The API package 'urlfetch' or call 'Fetch()' was not found.
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:98)
    at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:37)
    at com.google.api.client.extensions.appengine.http.UrlFetchRequest.execute(UrlFetchRequest.java:74)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.refresh(GooglePublicKeysManager.java:172)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.getPublicKeys(GooglePublicKeysManager.java:140)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:174)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:192)
    at com.omarhegazi.login.GoogleAuthenticator.authenticateToken(GoogleAuthenticator.java:40)
    at com.omarhegazi.login.ServerThread.run(ServerThread.java:45)

這是使用 v1.6.1

我還嘗試使用 v1.9.70，結果如下：

Exception in thread "Thread-0" com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API call urlfetch.Fetch in a thread that is neither the original request thread nor a thread created by ThreadManager
    at com.google.apphosting.api.ApiProxy$CallNotFoundException.foreignThread(ApiProxy.java:800)
    at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:112)
    at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:40)
    at com.google.api.client.extensions.appengine.http.UrlFetchRequest.execute(UrlFetchRequest.java:74)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:981)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.refresh(GooglePublicKeysManager.java:172)
    at com.google.api.client.googleapis.auth.oauth2.GooglePublicKeysManager.getPublicKeys(GooglePublicKeysManager.java:140)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:174)
    at com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier.verify(GoogleIdTokenVerifier.java:192)
    at com.omarhegazi.login.GoogleAuthenticator.authenticateToken(GoogleAuthenticator.java:40)
    at com.omarhegazi.login.ServerThread.run(ServerThread.java:45)

看起來 fetch 包被包含在 1.6.1 之后，但存在一些與進行 API 調用的線程相關的問題。

Answer 1

嘗試在pom.xml包含appengine依賴項：

<dependency>
    <groupId>com.google.appengine</groupId>
    <artifactId>appengine-api-1.0-sdk</artifactId>
    <version>1.6.1</version> <!-- Check your version --> 
</dependency>

鏈接到文檔

Answer 2

根據上面 ngueno 的帖子，我需要 appengine-api-1.0-sdk v1.9.70 才能使其正常工作：

 <dependency>
    <groupId>com.google.appengine</groupId>
    <artifactId>appengine-api-1.0-sdk</artifactId>
    <version>1.9.70</version>
</dependency>

要解決此版本的 appengine API 引發的“無法在既不是原始請求線程也不是 ThreadManager 創建的線程的線程中進行 API 調用 urlfetch.Fetch”錯誤，我必須更改使用的 HttpTransport從UrlFetchTransport.getDefaultInstance()到GoogleNetHttpTransport.newTrustedTransport()

IE：

    HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport();
    prop = new Properties();
prop.load(GoogleAuthenticator.class.getClassLoader().getResourceAsStream("config.properties"));

    GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(httpTransport, gsonFactory)
            // Specify the CLIENT_ID of the app that accesses the backend:
            .setAudience(Collections.singletonList(prop.getProperty("google.client.id")))
            .setIssuer("https://accounts.google.com")
            // Or, if multiple clients access the backend:
            //.setAudience(Arrays.asList(CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3, etc))
            .build();

        // (Receive idTokenString by HTTPS POST)

        GoogleIdToken idToken;

        idToken = verifier.verify(inputToken);

使用的所有參考資料和指南都指出 UrlFetchTransport.getDefaultInstance() 是線程安全的/使用的最佳選擇，但它在這里對我不起作用。