This repository was archived by the owner on Apr 2, 2026. It is now read-only.
This repository was archived by the owner on Apr 2, 2026. It is now read-only.
Java Storage NIO: FileSystemProvider::checkAccess fails on '/' with StorageException #1062
Description
Using com.google.cloud:google-cloud-nio:0.124.20 the CloudStorageFileSystemProvider implementation of FileSystemProvider.checkAccess fails when asking about the root directory.
Take this code fragment and fill in a cloud storage bucket name you have access to:
public class App {
private static final Logger LOG = LoggerFactory.getLogger(App.class);
public static void main(String[] args) {
String bucketName = "xxxxxxxxxxxx";
FileSystem fileSystem = FileSystems.getFileSystem(URI.create("gs://" + bucketName));
Path path = fileSystem.getPath("/");
FileSystemProvider provider = fileSystem.provider();
try {
provider.checkAccess(path, AccessMode.READ, AccessMode.WRITE);
}
catch (Exception e) {
LOG.error("{}", e);
}
LOG.warn("{}", path);
}
}Stack trace
NOTE: I have hidden the real bucket name.
com.google.cloud.storage.StorageException: Invalid field selection bucket
at com.google.cloud.storage.StorageException.translate(StorageException.java:163)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.translate(HttpStorageRpc.java:291)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.get(HttpStorageRpc.java:517)
at com.google.cloud.storage.StorageImpl.lambda$get$6(StorageImpl.java:298)
at com.google.api.gax.retrying.DirectRetryingExecutor.submit(DirectRetryingExecutor.java:103)
at com.google.cloud.RetryHelper.run(RetryHelper.java:76)
at com.google.cloud.RetryHelper.runWithRetries(RetryHelper.java:50)
at com.google.cloud.storage.Retrying.run(Retrying.java:60)
at com.google.cloud.storage.StorageImpl.run(StorageImpl.java:1476)
at com.google.cloud.storage.StorageImpl.get(StorageImpl.java:296)
at com.google.cloud.storage.contrib.nio.CloudStorageFileSystemProvider.checkAccess(CloudStorageFileSystemProvider.java:732)
at nl.basjes.bugreports.App.main(App.java:31)
Caused by: com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request
GET https://storage.googleapis.com/storage/v1/b/xxxxxxxxxxxx/o/?fields=bucket,name,id&projection=full
{
"code" : 400,
"errors" : [ {
"domain" : "global",
"location" : "fields",
"locationType" : "parameter",
"message" : "Invalid field selection bucket",
"reason" : "invalidParameter"
} ],
"message" : "Invalid field selection bucket"
}
at com.google.api.client.googleapis.json.GoogleJsonResponseException.from(GoogleJsonResponseException.java:146)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:118)
at com.google.api.client.googleapis.services.json.AbstractGoogleJsonClientRequest.newExceptionOnError(AbstractGoogleJsonClientRequest.java:37)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest$1.interceptResponse(AbstractGoogleClientRequest.java:439)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1111)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:525)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:466)
at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:576)
at com.google.cloud.storage.spi.v1.HttpStorageRpc.get(HttpStorageRpc.java:514)
... 9 more
External references such as API reference guides
Any additional information below
I ran into this problem when "simply" trying to attach Apache Mina SFTP to a Google Cloud Bucket.
Note that this all does work as expected on
- existing files/directories
- non-existing files/directories
Only on '/' it fails.