fileutils | Copying and moving files , how hard could it possible be | File Utils library

I am unable to delete folder containing a cloned repository created using jgit. I have tried all kinds of utility delete methods but none works. The error thrown while using FileUtils.deleteDirectory(file) is as follows

java.nio.file.AccessDeniedException: \repositories\Test\Test\.git\objects\pack\pack-21cdd19e90e9e6bd2e8d295ea04201969594fe96.idx

Tried the following,

1. I have seen a range of other answers, for example [1] and [2]. They are all concerned with cases wherein they created a repository with jgit first and then deleted it immediately after that. In my current scenario I want to check if a repository is already cloned at given path and delete if present. After doing this task, I want to clone a repository using jgit on the same path.
2. I tried cases wherein I created the repository with jgit, shut down my server. Started it again and then simply called a function to delete the folder created earlier. This again failed with the same error.
3. I also completely removed jgit from my initial code and from pom since it might be getting into loaded into classpath. I still get the same error when trying to delete. Tried again after restarting just to check, the issue still persists.
4. However, when I run the same deletion code from another Java program, it succeeds.

[1] How to remove local repository by Java code that was cloned by JGit java library?
[2] How do I release file system locks after cloning repo via JGit

Here is the original code snippet for reference,

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