[MAHOUT-177] Fix for "java.lang.ClassNotFoundException Exception"

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.2
• Fix Version/s: 0.2
• Assignee: Abdel Hakim Deneche
• Reporter: Abdel Hakim Deneche
• Created: 13/Sep/09 08:20
• Updated: 18/Nov/09 14:06
• Resolved: 06/Oct/09 05:36

Description

When trying to run the Synthetic Control Data examples (http://cwiki.apache.org/MAHOUT/syntheticcontroldata.html) in a pseudo-distributed Hadoop cluster I got the java.lang.ClassNotFoundException exception in kmeans and dirichlet. canopy and meanshift worked perfectly.

The past solution was to flatten the examples jar: unjar all the libs and pack them in a single jar file. I found that, for the clustering examples, you only need to unpack the mahout-core jar, and because the compiled classes are already available in core/target/classes I changed maven/build.xml as follows:

• grab the core/target/classes directly instead of the packed jar
• exclude apache-mahout-core-*.jar, this should exclude both apache-mahout-core.jar and apache-mahout-core-tests.jar (do the examples really need the core-tests jar ?)