[Java] NoSuchKey Error when Listing Image Files on Spaces so I can delete them

I have some 4 test image files on my DO Spaces and I need to delete them programmatically in a Java EE environment. I’m using the AWS (v2) SDK. The Java EE system is running on JBoss EAP 7.2.0.

The 4 test image files are created on the following path on DO Spaces console:

BUCKET_NAME/supplies/test_supply_id/supply_images

So I start with creating a ListObjectsRequest as follows:

String prefix = "supplies/test_supply_id/supply_images";

ListObjectsRequest listObjectsRequest = ListObjectsRequest
                .builder()
                .bucket(BUCKET_NAME)
                .prefix(prefix)
                .build();

Then I capture the result:

ListObjectsResponse listObjectsResponse = s3cDOSpaceClient.listObjects(listObjectsRequest);

List<S3Object> lsObjectsInBucket = loresListObjectsResponse.contents();

However, I get a software.amazon.awssdk.services.s3.model.NoSuchKeyException: null (Service: S3, Status Code: 404, Request ID: txREQUEST_ID) at the following line:

ListObjectsResponse listObjectsResponse = s3cDOSpaceClient.listObjects(listObjectsRequest);

What could I really be doing wrong? I’ve tried different patterns of the prefix, e.g. having a “/” at the end and/or front, but none has worked. It’s quite hard to find some good documentation on this online, infact even AWS Docs, as described here aren’t helping.

How can I resolve this?