[VFS-733] Parent layer of ZipFileSystem set to null through OnCallRefreshFileObject and DecoratedFileObject.refresh()

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2, 2.4, 2.3, 2.4.1
• Fix Version/s: 2.5.0
• Assignee: Unassigned
• Reporter: Falco
• Created: 04/Oct/19 10:45
• Updated: 08/Oct/19 16:17
• Resolved: 07/Oct/19 15:46

Description

When using FileObject#exists and FileObject#getContent on a ZIP file (in any order), the reference to the parent file system is set to null.

final FileObject zippedFile = new OnCallRefreshFileObject(fileInZip());
assertNotNull(zippedFile.getFileSystem().getParentLayer());

zippedFile.exists();
zippedFile.getContent();

assertNotNull(zippedFile.getFileSystem().getParentLayer()); // fails

For an executable example, refer to https://github.com/f4lco/vfs-repro/blob/master/src/test/java/vfs/ZipParentLayerTest.java.

I come to believe this does not work as intended. I'm also relatively clueless about a potential fix or workaround. For me, this bug blocks upgrading from VFS 2.1.