server-side declining and the large file junking, with UploadFileHandler ?

[rucko24]

Hi @mstahv

Well, I'm writing to you directly because I understand that you're the developer of this class, from Viritin itself, hehe...

https://github.com/rucko24/xsd-validator-ui/blob/main/src/main/java/com/rubn/xsdvalidator/view/Input.java#L331

I just have this here.

When I upload an .mp4 file, which I have as an unsupported file, it jumps to the catch

but when that exception is triggered, the

return new UploadFileHandler((InputStream inputStream, UploadFileHandler.FileDetails metadata) -> {
            try (final FastByteArrayOutputStream fastOutputStream = new FastByteArrayOutputStream()) {
                if (SupportFilesEnum.fromExtension(FileUtils.getFileExtension(metadata.fileName())) == SupportFilesEnum.UNKNOWN) {
                    throw new IllegalArgumentException("File not supported!");
                }
                String fileName = metadata.fileName();
                if (this.decompressionService.isCompressedFile(fileName)) {
                    List<DecompressedFile> files = this.decompressionService.decompressFile(fileName, inputStream);
                    files.forEach(decompressedFile -> {
                        this.executeUI(() -> this.processFile(metadata, decompressedFile.content(), true, decompressedFile));
                    });
                } else {
                    inputStream.transferTo(fastOutputStream);
                    byte[] bytes = fastOutputStream.toByteArray();
                    this.executeUI(() -> {
                        this.processFile(metadata, bytes, false, new DecompressedFile(null, null, 0L));
                    });
                }
                return () -> {
                    this.uploader.clearFileList();
                    this.searchPopover.updateItems(this.getXsdXmlFiles());
                };
            } catch (Exception error) {
                return () -> {
                    log.error("Error catch uploader: {}", error.getMessage());
                    Notification.show("Upload failed: " + error.getMessage(),
                                    2000, Notification.Position.MIDDLE)
                            .addThemeVariants(NotificationVariant.LUMO_WARNING);
                    this.uploader.clearFileList();
                };
            }
        })
                .withClearAutomatically(true)
                .withAddedClassName("upload-xml-xsd", LumoUtility.Padding.XSMALL, LumoUtility.Width.FULL,
                        LumoUtility.Margin.Right.MEDIUM, LumoUtility.Margin.Left.NONE)
                .withDragAndDrop(true)
                .withDropLabelIcon(new Span())
                .withDropLabel(new Span("Drop files here, only support: " + XsdValidatorConstants.SUPPORT_FILES))
                .withUploadButton(attachment);

Notification.show(“Upload failed: ” + error.getMessage(),
                                    2000, Notification.Position.MIDDLE)
                            .addThemeVariants(NotificationVariant.LUMO_WARNING);

It notifies approximately 6 times.

2026-01-29T19:23:05.705+01:00 ERROR 2284174 --- [nio-8888-exec-4] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!
2026-01-29T19:23:06.245+01:00 ERROR 2284174 --- [nio-8888-exec-7] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!
2026-01-29T19:23:06.440+01:00 ERROR 2284174 --- [nio-8888-exec-9] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!
2026-01-29T19:23:06.568+01:00 ERROR 2284174 --- [nio-8888-exec-3] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!
2026-01-29T19:23:06.727+01:00 ERROR 2284174 --- [nio-8888-exec-8] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!
2026-01-29T19:23:07.028+01:00 ERROR 2284174 --- [nio-8888-exec-5] com.rubn.xsdvalidator.view.Input         : Error catch uploader: File not supported!

From forum: https://vaadin.com/forum/t/uploadfilehandler-from-matti/179148

From Matti,

Sounds like a problem with server-side declining and the large file junking. Probably quite easy to fix, client side should check the error code (and server should set it to something else if not set already). Can you file an issue to the repo?

test with file size: 2.4GB

[mstahv]

I couldn't right away reproduce the issue, a full view reproducing the issue would be great.

Qualifying question:

What is the this.uploader ? The created UploadFileHandler?
Why do you need that FastByteArrayOutputStream from Spring, can't you just readAllBytes 🤔
Which browser are you using?

[mstahv]

I missed the link to a project where you have the issue, is it easy to get up and running?

[rucko24]

I missed the link to a project where you have the issue, is it easy to get up and running?

Hi @mstahv

The default setting opens a tab in your browser, but if you are using a Mac, disable @Bean with this:

app:
  app-version: 1.0.37-SNAPSHOT
  browser:
    auto-open: false

• https://github.com/rucko24/xsd-validator-ui
• https://github.com/rucko24/xsd-validator-ui/releases/tag/1.0.37-SNAPSHOT

Although you don't need to compile it either because of the dev.bundle I uploaded.

[matti]

pinging wrong matti here

[rucko24]

I couldn't right away reproduce the issue, a full view reproducing the issue would be great.

Qualifying question:

What is the this.uploader ? : The uploader is old, another old class, but you're right, i remove it
The created UploadFileHandler? : sorry, but no.
Why do you need that FastByteArrayOutputStream from Spring, can't you just readAllBytes 🤔 : Lmao, I thought it wasn't that bad.

Which browser are you using?: Google Chrome

Grabacion.de.pantalla.desde.2026-01-29.21-07-51.webm

[mstahv]

There is @matti with more repositories in GitHub than I have 😱

@rucko24

Checked out your app and the main issue is that you are catching that exception (and eating it) which is supposed to signal that there was a problem with upload. Made a PR that fixes that and couple of other changes to clean up the upload code. I think your problem though showed that:

• UplaodFileHandler should clear automatically also failed uploads
• the callback should have an easy access to the UI/component to e.g. show error notifiactions in the UI. The renewed core Vaadin Upload now has this 💪

Although I could claim you were holding it wrong, let's keep this open to get those fixed at some point.

[rucko24]

There is @matti with more repositories in GitHub than I have 😱

@rucko24

Checked out your app and the main issue is that you are catching that exception (and eating it) which is supposed to signal that there was a problem with upload. Made a PR that fixes that and couple of other changes to clean up the upload code. I think your problem though showed that:

• UplaodFileHandler should clear automatically also failed uploads
• the callback should have an easy access to the UI/component to e.g. show error notifiactions in the UI. The renewed core Vaadin Upload now has this 💪

Although I could claim you were holding it wrong, let's keep this open to get those fixed at some point.

Very good, it's working quite well with the changes.

Thank`s a lot @mstahv