Jgit does not release pack files after proper closure

[vrosu]

Version

6.10.1.202505221210-r

Operating System

Windows

Bug description

Create Git object based on a bare repo.
Set it to mirror a remote repo
Execute Pull
Close the repository will all available methods:

1. FileRepository close (we observe useCnt = 0)
2. RepositoryCache.clear()
3. Git.close()
4. WindowCacheConfig wconfig = new WindowCacheConfig();
   wconfig.setPackedGitMMAP(false);
   WindowCache.reconfigure(wconfig);
   Step 4 is based on other bug reports about this behavior
5. Thread.sleep(4000) - in case other threads need to finish some work
6. Delete the git folder on disk via recursive methods

Actual behavior

Error removing file \GitRepository\AT19021222.git\objects\pack\pack-0ae6de42f7a464520ac14706e3e385c0ca62c94d.idx; Error: java.nio.file.AccessDeniedException
Error removing file \GitRepository\AT19021222.git\objects\pack\pack-0ae6de42f7a464520ac14706e3e385c0ca62c94d.pack; Error: java.nio.file.AccessDeniedException

These are all the open files that can't be removed. All other Git files can safely be deleted.

Expected behavior

I would expect that these files can be deleted.

Relevant log output

Pasted as image in the other information. I am using source code and littered the code with some debug statements.
Note that WindowCache is never using mmap.
The exception for deleting the file from Java is observed at 14:33:55.916
Using the Process Monitor, I observe that as soon as the failure happens, the file is closed. Removing the file from Windows Explorer then works.

Other information

[vrosu]

I should probably edit or close this, but in reality my issue was not caused by the lock issue, but by the fact the files were set to read-only. I should have known this because while the webapp was still running, I was able to delete those 2 files outside of it with ease.
Adding a setWritable(true) in a catch block worked perfect.

[msohn]

This is behaviour of Windows and not a bug in JGit