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From "Stephan Schuster (JIRA)" <>
Subject [jira] Created: (VFS-239) File names are NOT case sensitive on Windows
Date Sun, 15 Feb 2009 16:26:59 GMT
File names are NOT case sensitive on Windows

                 Key: VFS-239
             Project: Commons VFS
          Issue Type: Bug
    Affects Versions: 1.1
         Environment: win xp
            Reporter: Stephan Schuster
             Fix For: 1.1

Extracted from mailing list:

I just encountered the following problem with Commons VFS on Windows:

FileSystemManager fsManager = VFS.getManager();
FileObject fo1 = fsManager.resolveFile("c:\\test.txt"); // lower case
FileObject fo2 = fsManager.resolveFile("C:\\test.txt"); // upper case
System.out.println(fo1.equals(fo2)); // false but should be true

A while ago i was wondering why AbstractFileObject does not overwrite equals() or hashCode()
but uses a simple object comparison (see

Mario Ivankovits answered:

"The current VFS implementation (if you do not use anything else then the only-working SoftRefFilesCache)
ensures that two resolveFile will return the same object if you ask for the same filename,
thus, in terms of VFS there is nothing bad with the object comparison."

That's right, however, the caching mechanism uses a TreeMap hashing file systems by a so called
FileSystemKey which encapsulates their root path as an implementation of FileName (on Windows:
WindowsFileName). Comparing two such FileSystemKeys internally results in a simple String
comparison where e.g. "c:" and "C:" are considered different. In the test case listed above,
VFS will therefore create two instances of FileObject, one for "c:\\test.txt" and one for
"C:\\test.txt". An object comparison between both obviously returns false even though it's
the same file.

Since file names are not case sensitive on Windows, equals(), hashCode() and compareTo() of
WindowsFileName should probably convert all paths to lower case before comparing them.

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