webclient appengine在本地工作但在Google Cloud appengine上引发异常

用于通过appengine访问谷歌驱动器的webclient oauth2适用于localhost appengine
但在谷歌 Cloud 应用程序引擎抛出异常 .

static GoogleAuthorizationCodeFlow initializeFlow() throws IOException {

    Log.info("in initializeFlow oauthUtils");
    return new GoogleAuthorizationCodeFlow.Builder(HTTP_TRANSPORT_REQUEST,
            JSON_FACTORY, getClientSecrets(), PERMISSION_SCOPES)
           getClientSecrets().getDetails().getClientId(), 
             getClientSecrets().getDetails().getClientSecret(), 
           PERMISSION_SCOPES)

            .setDataStoreFactory(DATA_STORE_FACTORY)
            .setAccessType("online").build();
    }


       AuthorizationCodeFlow authFlow = initializeFlow();
               Credential credential = 
            authFlow.loadCredential(getUserId(req));


     drive = new Drive.Builder(
            HTTP_TRANSPORT_REQUEST, JSON_FACTORY, credential)
            .setApplicationName(APPLICATION_NAME)
            .build();
    FileList result = null;

尝试{
result = drive.files（） . list（）
.setPageSize（10）
.setFields（“nextPageToken，files（id，name）”）
. 执行（）;
} catch（IOException e）{
Log.severe（“for filelist”）;
抛出新的IOException（“无法从服务中获取文件
OAuthUtils.getDataFromApi（）“）;
}

使用client_secrets.json

{"web":{"client_id":"1006959462162-qmlxxxxxxxxxx.apps.googleusercontent.com","project_id":"ggledrvsrvcaccntxxxxxxxx","auth_uri":"https://accounts.google.com/o/oauth2/auth","token_uri":"https://accounts.google.com/o/oauth2/token","auth_provider_x509_cert_url":"https://www.googleapis.com/oauth2/v1/certs","client_secret":"Z-GUR_uf2hfh_seMz","redirect_uris":["https://ggledrvsrvcaccnt.firebaseapp.com/__/auth/handler","https://www.getpostman.com/oauth2/callback","http://localhost:8080/oauth2callback","https://ggledrvsrvcaccntxxxxxxxx.appspot.com/oauth2callback"],"javascript_origins":["http://localhost","http://localhost:5000","https://ggledrvsrvcaccntxxxxxxxx.firebaseapp.com"]}}

这是谷歌 Cloud appengine的例外

result = drive.files().list()
                .setPageSize(10)
                .setFields("nextPageToken, files(id, name)")
                .execute();

并抛出异常 .

com.google.api.client.googleapis.json.GoogleJsonResponseException：401 {“code”：401，“errors”：[{“domain”：“global”，“location”：“授权”，“locationType”：“ Headers “，”消息“：”无效凭据“，”原因“：”authError“}]，”消息“：”无效凭据“} com.google.api.client.googleapis.json.GoogleJsonResponseException.from（GoogleJsonResponseException . java：146）at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError（AbstractGoogleJsonClientRequest.java:113）at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError（AbstractGoogleJsonClientRequest . java：40）at com.google.api.client.googleapis.services.AbstractGoogleClientRequest $ 1.interceptResponse（AbstractGoogleClientRequest.java:321）at com.google.api.client.http.HttpRequest.execute（HttpRequest.java:1065）at at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed（AbstractGoogleClientRequest.jav a：419）com.google.api.client.google客户网站上的com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:352）:( AbstractGoogleClientRequest.java:469）在com.jagdiv.webapplication.backend.OAuthUtils.getDriveService（OAuthUtils.java:120）在com.jagdiv.webapplication.backend.OAuthUtils.getDataFromApi（OAuthUtils.java:404）在com.jagdiv.webapplication.backend.DriveServlet.doPost （DriveServlet.java:88）在javax.servlet.http.HttpServlet.service（HttpServlet.java:637）的com.google.api.client.extensions.servlet.auth.oauth2.AbstractAuthorizationCodeServlet.service（AbstractAuthorizationCodeServlet.java:130） ）在javax.servlet.http.HttpServlet.service（HttpServlet.java:717）在org.mortbay.jetty.servlet.ServletHolder.handle（ServletHolder.java:511）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain . com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFil中的doFilter（ServletHandler.java:1166）之三（ParseBlobUploadFilter.java:125）在org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）在com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter（SaveSessionFilter.java:37） org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）位于org.mortbay.jetty.servlet的com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter（JdbcMySqlConnectionCleanupFilter.java:60） .ServletHandler $ CachedChain.doFilter（ServletHandler.java:1157）at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter（TransactionCleanupFilter.java:48）at org.mortbay.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler） .java：1157）org.mortbay.jetty.servlet.ServletHandler.handle（ServletHandler.java:388）org.mortbay.jetty.securityHandler.handle（SecurityHandler.java:216）org.mortbay.jetty . servlet.SessionHandler.handle（SessionHandler.java:182）at org.mortbay.jetty.handler.ContextHandler.ha ndle（ContextHandler.java:765）位于org.mortbay.jetty.webapp.WebAppContext.handle（WebAppContext.java:418）的com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle（AppVersionHandlerMap.java:257）org .mortbay.jetty.handler.HandlerWrapper.handle（HandlerWrapper.java:152）org.mortbay.jetty.Server.handle（Server.java:326）atg.mortbay.jetty.HttpConnection.handleRequest（HttpConnection.java:542） ）在org.mortbay.jetty.HttpConnection $ RequestHandler.headerComplete（HttpConnection.java:923）在com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable（RpcRequestParser.java:76）在org.mortbay.jetty.HttpConnection . 手柄（HttpConnection.java:404）在com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest（JettyServletEngineAdapter.java:145）在com.google.apphosting.runtime.JavaRuntime $ RequestRunnable.dispatchServletRequest（JavaRuntime.java:644）在com.google.apphosting.runtime.JavaRuntime $ RequestRunnable.dispatchRequest（JavaRuntime.java:604）在com.google.apphosting.runtime.JavaRuntime $ RequestRunnable.run（JavaRuntime.java:574）在com.google.tracing.TraceContext $ traceContextRunnable.runInContext（TraceContext.java:453）com.google.tracing.TraceContext $ TraceContextRunnable $ 1.run（TraceContext.java:460）at com.google.tracing.CurrentContext.runInContext（CurrentContext.java:293）at com www.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContextNoUnref（TraceContext.java:319）com.google.tracing.TraceContext $ AbstractTraceContextCallback.runInInheritedContext（TraceContext.java:311）com.google.tracing.TraceContext $ TraceContextRunnable.run（TraceContext） .java：457）在com.google.apphosting.runtime.ThreadGroupPool $ PoolEntry.run（ThreadGroupPool.java:238）at java.lang.Thread.run（Thread.java:745）

代码链接https://github.com/RupamShaw/GogleApplication/tree/master/backend/src/main注意：在本地主机访问屏幕上选择emailid，但是在googlecloud appengine上没有来自emailid的选择屏幕 . 请帮忙纠正 .