could you please give a list (or document in wiki, or I could edit it
), which mvn exec job requires exactly which file?

thanks
Yang

On Fri, Oct 21, 2011 at 1:56 PM, Sean Owen <[email protected]> wrote:
> Um, you are running the Netflix example on the GroupLens data set. Of
> course this doesn't work.
>
> On Fri, Oct 21, 2011 at 9:54 PM, Yang <[email protected]> wrote:
>> I got the following errors when running:
>>
>> $ mvn -X -e  -q exec:java
>> -Dexec.mainClass="org.apache.mahout.cf.taste.example.netflix.NetflixRecommenderEvaluatorRunner"
>> -Dexec.args="-i /home/yyang/work/mahout/trunk/examples/data/ml-1m/"
>>
>>
>>
>>
>> [DEBUG] joining on thread
>> Thread[org.apache.mahout.cf.taste.example.netflix.NetflixRecommenderEvaluatorRunner.main(),5,org.apache.mahout.cf.taste.example.netflix.NetflixRecommenderEvaluatorRunner]
>> [DEBUG] Setting accessibility to true in order to invoke main().
>> 11/10/21 13:52:01 INFO netflix.NetflixDataModel: Creating
>> NetflixDataModel for directory:
>> /home/yyang/work/mahout/trunk/examples/data/ml-1m
>> 11/10/21 13:52:01 INFO netflix.NetflixDataModel: Reading preference data...
>> [INFO] 
>> ------------------------------------------------------------------------
>> [ERROR] BUILD ERROR
>> [INFO] 
>> ------------------------------------------------------------------------
>> [INFO] An exception occured while executing the Java class. null
>>
>> [INFO] 
>> ------------------------------------------------------------------------
>> [DEBUG] Trace
>> org.apache.maven.lifecycle.LifecycleExecutionException: An exception
>> occured while executing the Java class. null
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:719)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:387)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
>>        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
>>        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
>>        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
>>        at 
>> org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>        at 
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>>        at 
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>        at java.lang.reflect.Method.invoke(Method.java:616)
>>        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
>>        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
>>        at 
>> org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
>>        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
>> Caused by: org.apache.maven.plugin.MojoExecutionException: An
>> exception occured while executing the Java class. null
>>        at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:346)
>>        at 
>> org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
>>        at 
>> org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
>>        ... 17 more
>> Caused by: java.lang.reflect.InvocationTargetException
>>        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>        at 
>> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>>        at 
>> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>        at java.lang.reflect.Method.invoke(Method.java:616)
>>        at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:291)
>>        at java.lang.Thread.run(Thread.java:679)
>> Caused by: java.lang.NullPointerException
>>        at 
>> org.apache.mahout.cf.taste.example.netflix.NetflixDataModel.readUsers(NetflixDataModel.java:79)
>>        at 
>> org.apache.mahout.cf.taste.example.netflix.NetflixDataModel.<init>(NetflixDataModel.java:68)
>>        at 
>> org.apache.mahout.cf.taste.example.netflix.NetflixRecommenderEvaluatorRunner.main(NetflixRecommenderEvaluatorRunner.java:44)
>>        ... 6 more
>> [INFO] 
>> ------------------------------------------------------------------------
>> [INFO] Total time: 2 seconds
>> [INFO] Finished at: Fri Oct 21 13:52:01 PDT 2011
>> [INFO] Final Memory: 23M/127M
>> [INFO] 
>> ------------------------------------------------------------------------
>>
>>
>> On Fri, Oct 21, 2011 at 1:21 AM, Sean Owen <[email protected]> wrote:
>>> It depends on which example you are running! For GroupLens, yes, it's
>>> the movies.dat file.
>>>
>>> I will warn you that I think the various GroupLens data sets have
>>> different input formats. Some are comma-separated, which is what you
>>> need, and some are separated by "::". Open the file and look. If it is
>>> the latter, you need to change it to comma-separated form.
>>>
>>> On Thu, Oct 20, 2011 at 11:41 PM, Yang <[email protected]> wrote:
>>>> in the recommendation examples
>>>>
>>>> https://cwiki.apache.org/confluence/display/MAHOUT/RecommendationExamples
>>>>
>>>> it mentions the "-i input_file " parameter,
>>>>
>>>> but the downloaded movie-lens dataset is a zip, and contains multiple
>>>> .dat files, which one should I use?
>>>>
>>>> Thanks
>>>> Yang
>>>>
>>>
>>
>>
>> how do I debug this?
>>
>

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