[jira] [Created] (VFS-733) Parent layer of ZipFileSystem vanishes

["Falco (Jira)" <ji...@apache.org>]

Falco created VFS-733:
-------------------------

             Summary: Parent layer of ZipFileSystem vanishes
                 Key: VFS-733
                 URL: https://issues.apache.org/jira/browse/VFS-733
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 2.4.1, 2.3, 2.4, 2.2
            Reporter: Falco


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}}.

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

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

assertNotNull(zippedFile.getFileSystem().getParentLayer()); // fails
{code}

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.







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