Using Java, I’m trying to delete files and folders on a NAS. Everything works perfectly, except when a user has opened Windows Explorer in a folder I want to delete.

For example, I have a folder A which contains a folder B. I want to delete folder B and then folder A. Folder B will be deleted, but not folder A. This only happens when someone uses Windows Explorer in folder B. My code says that folder A is not empty, it still contains folder B. But how can this be because folder B has just been deleted, and in Windows Explorer I can’t see folder B (even though hidden files are checked).

I’ve tried running this code locally and it works even though I have Windows Explorer open in folder B. This only happens with the NAS. Do you have any ideas?

void test(){
    isSuccessfullyRemoved = true
    Path p = Paths.get('FOLDER B')
    try (def ds = Files.newDirectoryStream(p)) {
        ds.each { subPath ->
            // Delete every files in the folder B
            if (subPath.toFile().isFile()) {
                deleteFileorFolder(subPath)
            }
        }
    }

    // The folder B should be empty if the deletion of the files was successful and does not contains a folder
    if (isSuccessfullyRemoved && isDirEmpty(p)) {
        // Delete Folder B
        deleteFileorFolder(p)

        // Folder B has been deleted, isSuccessfullyRemoved is TRUE but isDirEmpty is FALSE, why?
        if (isSuccessfullyRemoved && isDirEmpty(p.parent)) {
            deleteDirectory(p.parent.toFile())
        }
    }
}


boolean isDirEmpty(Path directory) {
    try (def ds = Files.newDirectoryStream(directory)) {
        return !ds.iterator().hasNext()
    }
}