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From Patrick Pekczynski <>
Subject Solr 1.4.1 and carrot2 clustering
Date Sun, 16 Jan 2011 13:57:41 GMT
Dear all,

I really enjoy using Solr so far. During the last days I tried to activate the ClusteringComponent
in Solr as indicated here

and copied all the relevant java libraries in the WEB-INF/lib folder of my tomcat installation
of Solr.

But everytime I try to issue a request to my Solr server using


I get the following error message:

  java.lang.NoClassDefFoundError: bak/pcj/set/IntSet
         at org.carrot2.text.preprocessing.PreprocessingPipeline.<init>(
         at org.carrot2.clustering.lingo.LingoClusteringAlgorithm.<init>(
         at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
         at sun.reflect.NativeConstructorAccessorImpl.newInstance(
         at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(
         at java.lang.reflect.Constructor.newInstance(
         at java.lang.Class.newInstance0(
         at java.lang.Class.newInstance(
         at org.carrot2.util.pool.SoftUnboundedPool.borrowObject(
         at org.carrot2.core.CachingController.borrowProcessingComponent(

Hence I have downloaded the corresponding pcj-1.2.jar providing the interface "bak.pcj.set.IntSet"
and I have also put it in the WEB-INF/lib folder

But I still keep getting this error message though the corresponding interface MUST be on
the classpath now.

Can anyone help me out with this one? I'm really eager to give this clustering extension a
try from within Solr using the 1.4.1 version that I have already
running on my server.

Thanks for a brief feedback.

Best regards,


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