private void scan(final URI u, final ScannerListener cfl) {
final UriSchemeScanner ss = scanners.get(u.getScheme().toLowerCase());
if (ss != null) {
ss.scan(u, cfl);
} else {
throw new ScannerException("The URI scheme " + u.getScheme() +
" of the URI " + u +
" is not supported. Package scanning deployment is not" +
" supported for such URIs." +