Why is TreeWalk.forPath(...) returning null

[Farrukh Najmi <farrukh@wellfleetsoftware.com>]

My "git status" command shows:

# On branch master
# Changed but not updated:
#   (use "git add <file>..." to update what will be committed)
#
#    modified:   xml/minDB/SubmitObjectsRequest_CMSScheme.xml

The file above was committed and then modified. I want to use jgit to 
find the comitted version of that file.

When I do the following code I get a null treeWalk? Why is that? What 
should I specify for path instead?

            String path = "xml/minDB/SubmitObjectsRequest_CMSScheme.xml";
            String versionName = Constants.HEAD;

            Commit commit = repository.mapCommit(versionName);

            if (commit == null) {
                log.trace("Did not find Commit. versionName:" + 
versionName);
            } else {
                ObjectId[] ids = {commit.getTree().getId()};
                TreeWalk treeWalk = TreeWalk.forPath(repository, path, ids);
            }

Thanks.

-- 
Regards,
Farrukh Najmi

Web: http://www.wellfleetsoftware.com