// Create the temp file system if it does not exist
// FileSystem filesystem = findFileSystem( this, (Properties) null);
FileSystem filesystem = findFileSystem(this, properties);
if (filesystem == null)
{
final FileName rootName =
getContext().parseURI(scheme + ":" + FileName.ROOT_PATH);
filesystem = new AppEngineLocalFileSystem(rootName, rootFile.getAbsolutePath(), properties);
addFileSystem(this, filesystem);
}