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AWS SDK for Java 2.x

public static void headBucket(S3Client s3Client, String bucketName) {
   try {
        HeadBucketRequest headBucketRequest = HeadBucketRequest
                .builder()
                .bucket(bucketName)
                .build();
        s3Client.headBucket(headBucketRequest);
        System.out.format("Amazon S3 bucket: \"%s\" found.", bucketName);
   }

   catch (S3Exception e) {
       System.err.println(e.awsErrorDetails().errorMessage());
       System.exit(1);
   }
}