How to use LinkDumper$Reader ?

[Patrick Kirsch]

Hey list,

 I'm trying to dump link information from webgraph for one URL.
The source 
(apache-nutch-1.7/src/java/org/apache/nutch/scoring/webgraph/LinkDumper.java) 
says:
[..]
  public static class Reader {
    public static void main(String[] args)
      throws Exception {

      if (args == null || args.length < 2) {
        System.out.println("LinkDumper$Reader usage: <webgraphdb> <url>");
        return;
      }

[..]

Now, If I try:
$ ./bin/nutch org.apache.nutch.scoring.webgraph.LinkDumper$Reader 
crawl_test/webgraph/ 'http://www.test.de/'
usage: LinkDumper
 -help                      show this help message
 -webgraphdb <webgraphdb>   the web graph database to use

So, I'm not able to use the Reader class for getting information.
Or do I use the LinkDumper$Reader in a wrong way?
Googling and nutch wiki did not help further


Regards,
 Patrick