In the CEF 130.1.9 update downloading files from the JCEF browser causes an empty popup window to appear

[adriaanse-deltares]

Describe the bug
I suppose related to recent changes in the Alloy runtime mode, an empty, modal Java window pops up when the user downloads a file with the typical "save file"" dialog on top of it.

Also, the CefClient.onBeforeDownload no longer works as the browser parameter is null

To Reproduce
Steps to reproduce the behavior:
0. Using Windows 11, I have not tested this on linux yet

1. Go to any web site where you can download a file '...'
2. Click on the file to download it and two dialog windows will pop up instead of just one

Expected behavior
only the file dialog would pop up.

Screenshots
If applicable, add screenshots to help explain your problem.

Versions (please complete the following information):

• OS: windows 11
• Java Version: Amazon corretto-11.0.24_8.
• JCEF Version: commit 7e0ef9d 11 nov 2024 (build using fork of https://github.com/jcefmaven/jcefmaven)
• CEF Version: [CEF 130.1.9+gfc42567+chromium-130.0.6723.70]

Additional context
Does the problem reproduce with the JCEF simple or detailed sample application at the same version?

Yes, except that here only a blank window pops up, no file dialog.

Does the problem reproduce with the CEF cefclient or cefsimple sample application at the same version?

Yes, behaviour of tests.simple.MainFrame and tests.detailed.MainFrame are the same

Does the problem reproduce with Google Chrome at the same version?

Add any other context about the problem here.

I see no other issues related to the changes in the Alloy runtime mode, looking good !

[adriaanse-deltares]

I just downloaded the update to CEF 135.0.20+ge7de5c3+chromium-135.0.7049.85 from the jcefmaven repository to find the problem downloading files is still there. Some observations:

The CefDownloadHandler interface has changed, now returning a boolean instead of void

The CefDownloadHandler calls now get null instead of a CefBrowser value passed on as the first argument, which causes CefClient to ignore the call so the downloadhandler no longer works.

By modifying the CefClient code now I can make our download handler work, but this weird blank popup screen remains, I see no place in the Java code where this could come from so this must be somewhere in the native code ?

[adriaanse-deltares]

Probably related, on Linux downloading a file fails with the error:

[33242:33405:0528/142730.527586:ERROR:file_dialog_manager.cc(406)] Default dialog implementation is not available; canceling the file dialog

but it does display the blank pop-up window

On windows (11) the file dialog does work and appears on top of the blank popup as in the given screenshot.

This blank popup appears before either onBeforeDownload() or onDownloadUpdated() is called, so canceling the download does not help....

[dmuatdbh]

Hi Bart,

I have exactly the same problem after updating my JCEF.
Can you provide your modified CefClient code or create a pull request with your solution.

Thank you in advance
Daniel

[adriaanse-deltares]

I am sorry but I have no solution for this