Java 为什么数据存储在解析URLFETCH的参数时抛出异常？

在“后端”Google App Engine Flexible Environment实例的后台线程中，使用Google Cloud API为数据存储运行一个简单的查询，在几秒钟的多次查询尝试中，我遇到了以下异常

An error occurred parsing (locally or remotely) the arguments to URLFETCH.Fetch()

（有关stacktrace，请参见下文。）

它与另一个错误同时出现

com.google.apphosting.vmruntime.VmApiProxyDelegate  convertApiResponseRpcErrorToException: RPC failed, API=urlfetch.Fetch : BAD_REQUEST : There is no active request context for this API call.

在异常之前，日志显示

 com.google.apphosting.vmruntime.VmRequestThreadFactory interruptRequestThreads: Request thread Thread-16 is still alive, forcing interrupt. 

及

这表明Google应用程序引擎超时，例如web请求的60秒限制。看看日志，这似乎不是真的。但无论如何，该查询在使用backgroundThreadFactory创建的后台线程中运行

这是我之前和之后在相同数据上运行的Java代码，没有此类问题，因此在运行时发生了特定的事情

什么会导致这个问题

堆栈跟踪：

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: com.google.cloud.datastore.DatastoreException: com.google.apphosting.api.ApiProxy$ArgumentException: An error occurred parsing (locally or remotely) the arguments to URLFETCH.Fetch(). at com.google.cloud.datastore.DatastoreException.translateAndThrow(DatastoreException.java:66) at com.google.cloud.datastore.DatastoreImpl.runQuery(DatastoreImpl.java:97) at com.google.cloud.datastore.QueryResultsImpl.sendRequest(QueryResultsImpl.java:73) at com.google.cloud.datastore.QueryResultsImpl.<init>(QueryResultsImpl.java:57) at com.google.cloud.datastore.DatastoreImpl.run(DatastoreImpl.java:82) at com.google.cloud.datastore.DatastoreImpl.run(DatastoreImpl.java:73) at com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup.loadEntity(GCloudApiDSBackup.java:692) at com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup$CopyEntities.loadOneEntity(GCloudApiDSBackup.java:1104) ... 7 more Caused by: com.google.apphosting.api.ApiProxy$ArgumentException: An error occurred parsing (locally or remotely) the arguments to URLFETCH.Fetch(). at com.google.apphosting.vmruntime.VmApiProxyDelegate.convertApiResponseRpcErrorToException(VmApiProxyDelegate.java:397) at com.google.apphosting.vmruntime.VmApiProxyDelegate.convertRemoteError(VmApiProxyDelegate.java:341) at com.google.apphosting.vmruntime.VmApiProxyDelegate.runSyncCall(VmApiProxyDelegate.java:187) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeApiCall(VmApiProxyDelegate.java:155) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCallWithTimeout(VmApiProxyDelegate.java:143) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCall(VmApiProxyDelegate.java:132) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCall(VmApiProxyDelegate.java:75) at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:118) 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.datastore.v1.client.RemoteRpc.call(RemoteRpc.java:87) at com.google.datastore.v1.client.Datastore.runQuery(Datastore.java:108) at com.google.cloud.datastore.spi.DefaultDatastoreRpc.runQuery(DefaultDatastoreRpc.java:158) at com.google.cloud.datastore.DatastoreImpl$1.call(DatastoreImpl.java:93) at com.google.cloud.datastore.DatastoreImpl$1.call(DatastoreImpl.java:89) at com.google.cloud.RetryHelper.doRetry(RetryHelper.java:179) at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:244) at com.google.cloud.datastore.DatastoreImpl.runQuery(DatastoreImpl.java:88) ... 13 more

java.util.concurrent.Executors$runnableapter.call（Executors.java:511）java.util.concurrent.FutureTask.run（FutureTask.java:266）java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）java.util.concurrent.ThreadPoolExecutor$Worker.run（Thread.java:745）原因：com.google.cloud.datastore.DatastoreException:com.google.apphosting.api.ApiProxy$ArgumentException:解析（本地或远程）URLFETCH.Fetch（）的参数时出错。com.google.cloud.datastore.DatastoreException.translateAndThrow（DatastoreException.java:66）com.google.cloud.datastore.DatastoreImpl.runQuery（DatastoreImpl.java:97）com.google.cloud.datastore.queryresultsiml.sendRequest（queryresultsiml.java:73）com.google.cloud.datastore.queryresultsiml.java:57com.google.cloud.datastore.DatastoreImpl.run（DatastoreImpl.java:82）com.google.cloud.datastore.DatastoreImpl.run（DatastoreImpl.java:73）com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup.loadEntity（GCloudApiDSBackup.java:692）com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup$copyenties.loadOneEntity（GCloudApiDSBackup.java:1104）…7其他原因：com.google.apphosting.api.ApiProxy$ArgumentException：在com.google.apphosting.vmruntime.vmapiproxydegate.convertapiresponserrortoException（vmapiproxydegate.java:397）解析URLFETCH.Fetch（）的参数时（本地或远程）发生错误com.google.apphosting.vmruntime.vmapiproxydegate.convertRemoteError（vmapiproxydegate.java:341）com.google.apphosting.vmruntime.vmapiproxydegate.runSyncCall（vmapiproxydegate.java:187）com.google.apphosting.vmruntime.vmapiproxydegate.makeApiCall（vmapiproxydegate.java:155）在com.google.apphosting.vmruntime.vmapiproxydegate.makeSyncCallWithTimeout（vmapiproxydegate.java:143）在com.google.apphosting.vmruntime.vmapiproxydegate.makeSyncCall（vmapiproxydegate.java:132）在com.google.apphosting.api.apiproxydegate.makeSyncCall（vmapiproxydegate.java:75）在com.google.apphosting.api.api.approxydegate.makeSyncCall（ApiProxy.java:118）在com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch（URLFetchServiceImpl.java:40）在com.google.api.client.extensions.appengine.http.UrlFetchRequest.execute（UrlFetchRequest.java:74）在com.google.api.client.http.HttpRequest.execute（HttpRequest.java:981）在com.google.datastore.v1.client.RemoteRpc.call（RemoteRpc.java:87）在com.google.datastore.v1.client.datastore.runQuery（datastore.java:108）在com.google.cloud.datastore.spi.DefaultDatastoreRpc.runQuery（DefaultDatastoreRpc.java:158）在com.google.cloud.datastore.DatastoreImpl$1.call（DatastoreImpl.java:93）在com.google.cloud.DatastoreImpl.DatastoreImpl$1.call（DatastoreImpl.java:89）在com.google.cloud.RetryHelper.doRetry（RetryHelper.java:179）在com.google.cloud.RetryHelper.runWithRetries（RetryHelper.java:244）在com.google.cloud.datastore.DatastoreImpl.runQuery（DatastoreImpl.java:88）…13更多信息

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: com.google.cloud.datastore.DatastoreException: com.google.apphosting.api.ApiProxy$ArgumentException: An error occurred parsing (locally or remotely) the arguments to URLFETCH.Fetch(). at com.google.cloud.datastore.DatastoreException.translateAndThrow(DatastoreException.java:66) at com.google.cloud.datastore.DatastoreImpl.runQuery(DatastoreImpl.java:97) at com.google.cloud.datastore.QueryResultsImpl.sendRequest(QueryResultsImpl.java:73) at com.google.cloud.datastore.QueryResultsImpl.<init>(QueryResultsImpl.java:57) at com.google.cloud.datastore.DatastoreImpl.run(DatastoreImpl.java:82) at com.google.cloud.datastore.DatastoreImpl.run(DatastoreImpl.java:73) at com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup.loadEntity(GCloudApiDSBackup.java:692) at com.freightos.backup.datastore.gcloudapi.GCloudApiDSBackup$CopyEntities.loadOneEntity(GCloudApiDSBackup.java:1104) ... 7 more Caused by: com.google.apphosting.api.ApiProxy$ArgumentException: An error occurred parsing (locally or remotely) the arguments to URLFETCH.Fetch(). at com.google.apphosting.vmruntime.VmApiProxyDelegate.convertApiResponseRpcErrorToException(VmApiProxyDelegate.java:397) at com.google.apphosting.vmruntime.VmApiProxyDelegate.convertRemoteError(VmApiProxyDelegate.java:341) at com.google.apphosting.vmruntime.VmApiProxyDelegate.runSyncCall(VmApiProxyDelegate.java:187) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeApiCall(VmApiProxyDelegate.java:155) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCallWithTimeout(VmApiProxyDelegate.java:143) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCall(VmApiProxyDelegate.java:132) at com.google.apphosting.vmruntime.VmApiProxyDelegate.makeSyncCall(VmApiProxyDelegate.java:75) at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:118) 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.datastore.v1.client.RemoteRpc.call(RemoteRpc.java:87) at com.google.datastore.v1.client.Datastore.runQuery(Datastore.java:108) at com.google.cloud.datastore.spi.DefaultDatastoreRpc.runQuery(DefaultDatastoreRpc.java:158) at com.google.cloud.datastore.DatastoreImpl$1.call(DatastoreImpl.java:93) at com.google.cloud.datastore.DatastoreImpl$1.call(DatastoreImpl.java:89) at com.google.cloud.RetryHelper.doRetry(RetryHelper.java:179) at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:244) at com.google.cloud.datastore.DatastoreImpl.runQuery(DatastoreImpl.java:88) ... 13 more