AmazonS3ClientBuilder.defaultClient() fails to account for region?

Looks like a region is required for the builder. Probably this thread is related (I would use .withRegion(Regions.US_EAST_1) though in the 3rd line):

To emulate the previous behavior (no region configured), you'll need to also enable "forced global bucket access" in the client builder:

AmazonS3 client = 
        AmazonS3ClientBuilder.standard()
                             .withRegion("us-east-1") // The first region to try your request against
                             .withForceGlobalBucketAccess(true) // If a bucket is in a different region, try again in the correct region
                             .build();

This will suppress the exception you received and automatically retry the request under the region in the exception. It is made explicit in the builder so you are aware of this cross-region behavior. Note: The SDK will cache the bucket region after the first failure, so that every request against this bucket doesn't have to happen twice.

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Also, from the AWS documentation if you want to use AmazonS3ClientBuilder.defaultClient(); then you need to have ~/.aws/credentials and ~/.aws/config files

~/.aws/credentials contents:

[default]
aws_access_key_id = your_id
aws_secret_access_key = your_key

~/.aws/config contents:

[default]
region = us-west-1

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From the same AWS documentation page, if you don't want to hardcode the region/credentials, you can have it as environment variables in your Linux machine the usual way:

export AWS_ACCESS_KEY_ID=your_access_key_id
export AWS_SECRET_ACCESS_KEY=your_secret_access_key
export AWS_REGION=your_aws_region