Clustering help

[Kenan Azam]

Hi there,
I am using nutch 0.8.1 to do a site wide search and it works great. Now I am
trying to add clustering using clustering-carrot2 plugin. I have followed
the instructions on http://wiki.apache.org/nutch/ClusteringPlugin but the
following piece of code returns the OnlineClusterer as null.

OnlineClusterer clusterer = null;
                  try {
                    clusterer = new
OnlineClustererFactory(nutchConf).getOnlineClusterer();
                  } catch (PluginRuntimeException e) {
                    // NOTE: Dawid Weiss
                    // should we ignore plugin exceptions, or rethrow it?
Rethrowing
                    // it effectively prevents the servlet class from being
loaded into
                    // the JVM
                  }


On a little digging I see that

 this.extensionName = conf.get(CONFIG_FIELD_NAME);

extensionName come back as null as well.

Any ideas, thanks.