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

Question

我正在尝试按照以下方式使用后端服务器验证 Google ID 令牌：

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

令牌最初由 android 应用程序检索，然后通过尝试验证的套接字传递到后端登录服务器。 就目前情况而言，在我导入的 GoogleIdTokenVerifier 代码中在运行时抛出了一个错误。

服务器线程.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>

我目前看到以下堆栈跟踪：

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)

看起来依赖项中没有可用的 HTTPMethod 类。 有什么想法吗？

更新1：

添加下面的 appengine 依赖项已经取得了一些进展。 我现在有以下堆栈跟踪错误：

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)

这是使用 v1.6.1

我还尝试使用 v1.9.70，结果如下：

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)

看起来 fetch 包被包含在 1.6.1 之后，但存在一些与进行 API 调用的线程相关的问题。

Answer 1

尝试在pom.xml包含appengine依赖项：

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

链接到文档

Answer 2

根据上面 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>

要解决此版本的 appengine API 引发的“无法在既不是原始请求线程也不是 ThreadManager 创建的线程的线程中进行 API 调用 urlfetch.Fetch”错误，我必须更改使用的 HttpTransport从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);

使用的所有参考资料和指南都指出 UrlFetchTransport.getDefaultInstance() 是线程安全的/使用的最佳选择，但它在这里对我不起作用。