AWS TransferManager uploadFileList truncating file name in S3

Question

I am trying to batch upload a couple of files in S3 using TranferManager. Below is my code:

@GetMapping("s3/batch/upload/base64")
public void uploadBase64ToWebp() {

     List<File> fileList = new ArrayList<>();
    String rawData = "1";
    String base64Data = Base64.encodeBase64String(rawData.getBytes(StandardCharsets.UTF_8));
     byte[] data = getBinaryImageData(base64Data);
     File file = new File("1234.webp");
     try {

         FileUtils.writeByteArrayToFile(file, data);

     } catch (IOException e) {

         System.out.println(e);
     }
     fileList.add(file);
     ObjectMetadataProvider metadataProvider = new ObjectMetadataProvider() {
            public void provideObjectMetadata(File file, ObjectMetadata metadata) {

                metadata.setContentType("image/webp");
                metadata.getUserMetadata().put("filename", file.getPath());
                metadata.getUserMetadata().put("createDateTime", new Date().toString());
            }
        };
        TransferManager transferManager = TransferManagerBuilder.standard().withS3Client(amazonS3).build();
     transferManager.uploadFileList(bucketName, "school/transactions", new File("."), fileList, metadataProvider);
}

private byte[] getBinaryImageData(String image) {

        return Base64.decodeBase64(
            image
                .replace("data:image/webp;base64,", "")
                .getBytes(StandardCharsets.UTF_8)
        );
    }

Here,as you can see, I am giving the file name as '1234.webp', but the file name that is getting saved in S3 is '34.webp'. I tried a bigger name like '1234567.webp' and again the first two digits get truncated and the file name is '34567.webp'. What i am doing wrong?

Please note, that in the example that i have pasted here, i am just uploading one file but in my actual code, I do upload multiple files, but in both the cases, the names get truncated anyhow.

Answer 1

Ok, so it was a Java IO issue. I updated the below to show the path and it worked.

Old:

File file = new File("1234.webp");

New:

File file = new File("./1234.webp");

Still trying to figure out why the first two letters got dropped.