Running Mahout from the command line (CLASSPATH)

Question

Complied Mahout successfully under Windows using Maven.

I'm trying to run one of the examples from the command line and I don't get what I am doing wrong. Seems like a CLASSPATH problem.

Let's say I want to run the GroupLensRecommenderEvaluatorRunner example. I go to the folder with the GroupLensRecommenderEvaluatorRunner.class file in it and execute:

java -cp C:/mahout/core/target/classes;. 

org.apache.mahout.cf.taste.example.grouplens.GroupLensRecommenderEvaluatorRunner

It gives me the NoClassDefFoundError exception for the GroupLensRecommenderEvaluatorRunner class.

Is the path for -cp wrong?

btw, for those who aren't familiar with mahout,

org.apache.mahout.cf.taste.example.grouplens

is the package of the GroupLensRecommenderEvaluatorRunner class. javadoc

thanks guys.

p.s - I first looked on previous stackoverflow questions on CLASSPATH and followed the given solutions, before asking this question.

Answer 1

This is better asked at [email protected].

Your classpath is missing compiled code in Mahout's examples module, which is where this class lives.

Better yet, have a look at this walkthrough: https://cwiki.apache.org/confluence/display/MAHOUT/Recommender+Documentation