ListObjectVersions does not contain Storage Class info

[nickklon]

Describe the bug

ListObjectVersionsResponse has a list of ObjectVersion, which uses its own enum for storage class, ObjectVersionStorageClass. This enum currently has only two values: STANDARD and UNKNOWN_TO_SDK_VERSION. The result is any StorageClass other than Standard is unknown.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

Storage class info to be available list as it is via the CLI

Current Behavior

Objects in storage classes other than standard show up as UNKOWN_TO_SDK_VERSION

Reproduction Steps

val listing = s3Client.listObjectVersions(..) // call on a prefix with IntelligentTiering data
for (v in listing.versions()) {
  println(version.storageClass().toString()) // prints null or STANDARD only
}

Possible Solution

This train has probably left the station, but use the same enum as a list-objects-v2 or get-objects call

Additional Information/Context

No response

AWS Java SDK version used

2.42.21

JDK version used

Irrelevant

Operating System and version

Irrelevant

[bhoradc]

Hi @nickklon

Thanks for reporting the issue. The ListObjectVersions API does return the correct storage class value on the wire (e.g. INTELLIGENT_TIERING), however the ObjectVersionStorageClass enum in the SDK only contains STANDARD, which causes storageClass() to return UNKNOWN_TO_SDK_VERSION for any other value.

This is a service model issue and I have notified the S3 service team to investigate a fix. I will follow up here once we hear back from them.

In the meantime, you can work around this by using storageClassAsString() instead of storageClass() on ObjectVersion.

for (ObjectVersion v : response.versions()) {
    String storageClass = v.storageClassAsString(); // returns "INTELLIGENT_TIERING", etc.
}

Regards,
Chaitanya