// Test field with CustomSize annotation for testing
    @CustomSize(minKey = "test.min", maxKey = "test.max")
    private String testField;

    // Test field with only minKey
    @CustomSize(minKey = "test.min.only")
    private String testFieldMinOnly;

    // Test field with only maxKey
    @CustomSize(maxKey = "test.max.only")
    private String testFieldMaxOnly;

    // Test field with custom message

        final List<StorageItem> items = new ArrayList<>();

        try {
            final ListObjectsV2Request.Builder requestBuilder =
                    ListObjectsV2Request.builder().bucket(bucket).delimiter("/").maxKeys(maxItems);

            if (StringUtil.isNotBlank(prefix)) {
                final String normalizedPrefix = prefix.endsWith("/") ? prefix : prefix + "/";
                requestBuilder.prefix(normalizedPrefix);