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From "Mizrachi, Dror" <dror.mizra...@intel.com>
Subject java.lang.NoClassDefFoundError: org/apache/commons/cli2/Option
Date Sun, 26 Aug 2012 07:32:49 GMT
Hi

I'm a new Mahout user.
I tried running the follow command and got this exception - any idea why and how to solve
it?

$ hadoop jar mahout-core-0.5.jar org.apache.mahout.cf.taste.hadoop.item.RecommenderJob -Dmapred.input.dir=/user/xxx/input
-Dmapred.output.dir=/user/xxx/output --recommenderClassName org.apache.mahout.cf.taste.impl.recommender.GenericItemBasedRecommender
--numRecommendations 10
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/cli2/Option
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:247)
        at org.apache.hadoop.util.RunJar.main(RunJar.java:179)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.cli2.Option
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        ... 3 more


Thanks,
Dror

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