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From Sean Owen <>
Subject Re: Running mahout taste examples?
Date Wed, 26 Sep 2012 14:07:27 GMT
You need to run these as a Java program and so the Mahout classes have
to be in the classpath. You need core, math, and examples. You can add
these as JARs or use Maven + Eclipse to grab them automatically. But
yes you will get an error about no classes being found unless this is

On Wed, Sep 26, 2012 at 2:57 PM, Tintarev, N <> wrote:
> Thanks Sean,
> Not sure what other information I could give? I want to run the existing
> code to run the Jester example.
> I couldn't find a tutorial for Eclipse, so I grabbed the code (using maven
> as recommended) and tried to run it as I do my regular
> Eclipse projects. The jester RecommenderEvaluatorRunner won't run, I get a
> NoClassDefFoundError.
> And yes, it looks like an eclipse specific issue (rather than Mahout per
> se), and it's likely trivial. Still, words of wisdom from someone that's
> done it from the IDE would be appreciated.
> /n.
> On 26/09/2012 14:29, "Sean Owen" <> wrote:
>>This isn't really enough information... it sounds like you aren't
>>actually including the right classes in the classpath of whatever you
>>are running. -Djava.library.path has nothing do with it; that's for
>>loading native libraries. You may want to review how you run any Java
>>program and set its classpath. This is nothing to do with Mahout per
>>On Wed, Sep 26, 2012 at 2:25 PM, Tintarev, N <> wrote:
>>> Hi,
>>> I am having a go with Mahout taste examples, but getting stuck with
>>>trivial things.
>>> I hope you don't mind giving me a pointer or two?
>>> I'm running 64bit OSx and setting it all up in Eclipse.
>>> I've set up M2e and checked out the code from SCM using maven.
>>> No problems, project looks fine ­ a whole bunch of files and
>>>directories, including the RecommenderEvalutatorRunners for each dataset.
>>> Downloaded the Jester1 data set and converted it to .csv
>>> Running the evaluator directly somehow  doesn't work ­ it's like it
>>>doesn't have a main class (NoClassDefFoundError).
>>> Setting main class with the full path or -Djava.library.path=
>>> didn't bear
>>>any fruit either.
>>> The quick start which is based on command line suggests maven needs to
>>>build a few things.
>>> Is this possibly something I need to do in Eclipse? What did I forget
>>>to do? :)
>>> Best regards,
>>> /Nava
>>> The University of Aberdeen is a charity registered in Scotland, No
> The University of Aberdeen is a charity registered in Scotland, No SC013683.

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