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https://issues.apache.org/jira/browse/MAHOUT-427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12891774#action_12891774
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Drew Farris commented on MAHOUT-427:
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bq. Based on some of the output it looks like this may be another missing 
job.setJarByClass(Class) issue

That appears to be exactly what the problem is.

> $MAHOUT_HOME/examples/bin/build-reuters.sh doesn't run successfully because 
> of classpath issues related to the -core argument
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAHOUT-427
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-427
>             Project: Mahout
>          Issue Type: Bug
>    Affects Versions: 0.4
>         Environment: Hadoop installation on EC2 as described here - 
> https://cwiki.apache.org/MAHOUT/mahoutec2.html
>            Reporter: Peter Goldstein
>
> Once I resolved issue MAHOUT-426 , I was still not able to run the 
> ./examples/bin/build-reuters.sh script without errors  These were 
> ClassNotFoundExceptions, indicating a problem with the classpath.  
> The issue appears to be related to the "-core" argument, which controls the 
> classpath.  Placing '-core' as the first argument to the individual 
> $MAHOUT_HOME/bin/mahout calls in the script solved the issue, but I'm not 
> sure it was the correct solution.  It's unclear to me what the '-core' 
> argument is supposed to signify.
> Can someone shed some light on this, and tell me whether this is the correct 
> solution to the problem?  And if not, what is the correct solution to this 
> classpath issue.

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