Solr 3.6.1 ClassNotFound Exception

[Zhang, Lisheng]

Hi,

This is perhaps a trivial question but somehow I could not pin-down:
when trying to index a file (using solr 3.6.1) I got the error:

Caused by: org.apache.solr.common.SolrException: Error loading class 
'solr.extraction.ExtractingRequestHandler'

I know in solrconfig.xml we have defined 

///
<requestHandler name="/update/extract" 
                  startup="lazy"
                  class="solr.extraction.ExtractingRequestHandler" >
///

and the jar file should be:

<SOLR_HOME>/dist/apache-solr-cell-3.6.1.jar

But above jar file only have class:

jar tvf apache-solr-cell-3.6.1.jar | grep ExtractingRequestHandler
  5332 Tue Jul 17 12:45:40 PDT 2012 
org/apache/solr/handler/extraction/ExtractingRequestHandler.class

Where we can find "solr.extraction.ExtractingRequestHandler" ?

Thanks very much for helps, Lisheng