Hello Anand, Whenever you find a reproducible error we strongly encourage that you report it to our Issue Tracker <https://cloud.google.com/support/docs/issue-trackers> to help us find and fix these issues.
This being said in this particular scenario it appears that the Language API is not yet supported on App Engine Standard <https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/language/analysis>. I will attempt to find out if the release of Java 8 for App Engine standard was meant to change this state of affairs. On Wednesday, July 12, 2017 at 7:38:25 AM UTC-4, Anand Srinivasan wrote: > > We recently started looking into switching to java 8 so that we can use > the myriad benefits that it offers including grpc. We tried using grpc for > the google cloud natural language API but we were unable to get that to > work. Here is the stack trace that we hit when trying to make the > analyzeSentiment call. > > com.google.api.server.spi.SystemService invokeServiceMethod: exception > occurred while calling backend method (SystemService.java:398 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=SystemService.java&line=398&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > com.google.api.gax.grpc.ApiException: io.grpc.StatusRuntimeException: > UNAUTHENTICATED at > com.google.api.gax.grpc.ExceptionTransformingCallable$ExceptionTransformingFuture.onFailure( > ExceptionTransformingCallable.java:108 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fapi%2Fgax%2Fgrpc%2FExceptionTransformingCallable.java&line=108&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.api.core.ApiFutures$1.onFailure(ApiFutures.java:53 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fapi%2Fcore%2FApiFutures.java&line=53&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.common.util.concurrent.Futures$4.run(Futures.java:1123 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fcommon%2Futil%2Fconcurrent%2FFutures.java&line=1123&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute( > MoreExecutors.java:435 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fcommon%2Futil%2Fconcurrent%2FMoreExecutors.java&line=435&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.common.util.concurrent.AbstractFuture.executeListener( > AbstractFuture.java:900 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fcommon%2Futil%2Fconcurrent%2FAbstractFuture.java&line=900&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.common.util.concurrent.AbstractFuture.complete( > AbstractFuture.java:811 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fcommon%2Futil%2Fconcurrent%2FAbstractFuture.java&line=811&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.common.util.concurrent.AbstractFuture.setException( > AbstractFuture.java:675 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fcommon%2Futil%2Fconcurrent%2FAbstractFuture.java&line=675&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.stub.ClientCalls$GrpcFuture.setException(ClientCalls.java:466 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Fstub%2FClientCalls.java&line=466&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.stub.ClientCalls$UnaryStreamToFuture.onClose( > ClientCalls.java:442 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Fstub%2FClientCalls.java&line=442&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:426 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FClientCallImpl.java&line=426&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.ClientCallImpl.access$100(ClientCallImpl.java:76 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FClientCallImpl.java&line=76&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close( > ClientCallImpl.java:512 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FClientCallImpl.java&line=512&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$700( > ClientCallImpl.java:429 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FClientCallImpl.java&line=429&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at > io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext( > ClientCallImpl.java:544 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FClientCallImpl.java&line=544&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FContextRunnable.java&line=52&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:117 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Finternal%2FSerializingExecutor.java&line=117&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) > > at > java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:295) > > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > > at java.lang.Thread.run(Thread.java:745) Caused by: > io.grpc.StatusRuntimeException: UNAUTHENTICATED at > io.grpc.Status.asRuntimeException(Status.java:543 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2FStatus.java&line=543&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > ... 15 more Caused by: java.io.IOException: Could not get the access token. > at com.google.auth.oauth2.AppEngineCredentials.refreshAccessToken( > AppEngineCredentials.java:136 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fauth%2Foauth2%2FAppEngineCredentials.java&line=136&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.auth.oauth2.OAuth2Credentials.refresh( > OAuth2Credentials.java:149 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fauth%2Foauth2%2FOAuth2Credentials.java&line=149&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at com.google.auth.oauth2.OAuth2Credentials.getRequestMetadata( > OAuth2Credentials.java:135 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fauth%2Foauth2%2FOAuth2Credentials.java&line=135&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > at io.grpc.auth.GoogleAuthLibraryCallCredentials$1.run( > GoogleAuthLibraryCallCredentials.java:110 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=io%2Fgrpc%2Fauth%2FGoogleAuthLibraryCallCredentials.java&line=110&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > ... 7 more Caused by: java.lang.reflect.InvocationTargetException at > sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > at java.lang.reflect.Method.invoke(Method.java:498) at > com.google.auth.oauth2.AppEngineCredentials.refreshAccessToken( > AppEngineCredentials.java:131 > <https://console.cloud.google.com/debug/fromlog?appModule=default&appVersion=aniruddha2&file=com%2Fgoogle%2Fauth%2Foauth2%2FAppEngineCredentials.java&line=131&logInsertId=5965ffa200005d6159bb2c7b&logNanos=1499856800011609000&nestedLogIndex=45&project=village-test>) > > ... 10 more Caused by: > com.google.apphosting.api.ApiProxy$CallNotFoundException: Can't make API > call memcache.Get 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:844) > > at com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:183) at > com.google.apphosting.api.ApiProxy$1.get(ApiProxy.java:180) at > com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:93) at > com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:28) > > at > com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:51) > > at > com.google.appengine.api.appidentity.AppIdentityServiceImpl.getAccessToken(AppIdentityServiceImpl.java:300) > > ... 15 more > > The stack trace looks similar to the one posted in this link: > https://github.com/GoogleCloudPlatform/google-cloud-java/issues/1918#issuecomment-299004772. > > It's unclear from the discussion there whether this issue was ever fixed. > In either case, what can we do to get around this? > > Thanks, > Anand > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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