MailEntityProcessor class cast exception

[Max Lynch]

With last night's build of solr, I am trying to use the MailEntityProcessor
to index an email account.  However, when I call my dataimport url, I
receive a class cast exception:

INFO: [] webapp=/solr path=/dataimport params={command=full-import} status=0
QTime=44
Jun 16, 2010 8:16:03 PM org.apache.solr.handler.dataimport.SolrWriter
readIndexerProperties
WARNING: Unable to read: dataimport.properties
Jun 16, 2010 8:16:03 PM org.apache.solr.update.DirectUpdateHandler2
deleteAll
INFO: [] REMOVING ALL DOCUMENTS FROM INDEX
Jun 16, 2010 8:16:03 PM org.apache.solr.core.SolrDeletionPolicy onInit
INFO: SolrDeletionPolicy.onInit: commits:num=1

 
commit{dir=/home/m/g/spider/misc/solrindex_nl/index,segFN=segments_1,version=1276738117525,generation=1,filenames=[segments_1]
Jun 16, 2010 8:16:03 PM org.apache.solr.core.SolrDeletionPolicy
updateCommits
INFO: newest commit = 1276738117525
Jun 16, 2010 8:16:03 PM org.apache.solr.handler.dataimport.DataImporter
doFullImport
SEVERE: Full Import failed
org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to
load EntityProcessor implementation for entity:99544078513223 Processing
Document # 1
        at
org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow(DataImportHandlerException.java:72)
        at
org.apache.solr.handler.dataimport.DocBuilder.getEntityProcessor(DocBuilder.java:804)
        at
org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:535)
        at
org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:260)
        at
org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:184)
        at
org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:334)
        at
org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:392)
        at
org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:373)
Caused by: java.lang.ClassCastException:
org.apache.solr.handler.dataimport.MailEntityProcessor cannot be cast to
org.apache.solr.handler.dataimport.EntityProcessor
        at
org.apache.solr.handler.dataimport.DocBuilder.getEntityProcessor(DocBuilder.java:801)
        ... 6 more
Jun 16, 2010 8:16:03 PM org.apache.solr.update.DirectUpdateHandler2 rollback
INFO: start rollback
Jun 16, 2010 8:16:03 PM org.apache.solr.update.DirectUpdateHandler2 rollback
INFO: end_rollback

Here is my dataimport part of my solrconfig.xml:
  <requestHandler name="/dataimport"
class="org.apache.solr.handler.dataimport.DataImportHandler">
      <lst name="defaults">
          <str
name="config">/home/max/packages/apache-solr-4.0-2010-06-16_08-05-33/e/solr/conf/data-config.xml</str>
      </lst>
  </requestHandler>

and my data-config.xml:
<dataConfig>
<document>
   <entity processor="MailEntityProcessor"
           user="***"
           password="***"
           host="***"
           protocol="imaps"
           folders = "INBOX"/>
</document>
</dataConfig>

I did try to rebuild the solr nightly, but I still receive the same error.
 I have all of the required jar's (AFAIK) in my application's lib folder.

Any ideas?

Thanks.