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https://issues.apache.org/jira/browse/MAHOUT-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096032#comment-13096032
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Jack Tanner commented on MAHOUT-799:
------------------------------------
To avoid having to build the cross-wiring, you could just detect this execution
pattern and exit with a message that explains the proper command-line use.
Which begs the question, how does one run it correctly from the command line?
> Cannot run SequenceFilesFromCsvFilter, ever
> -------------------------------------------
>
> Key: MAHOUT-799
> URL: https://issues.apache.org/jira/browse/MAHOUT-799
> Project: Mahout
> Issue Type: Bug
> Components: Examples
> Affects Versions: 0.5, 0.6
> Reporter: Jack Tanner
>
> As described here:
> http://mail-archives.apache.org/mod_mbox/mahout-user/201106.mbox/%[email protected]%3E
> SequenceFilesFromCsvFilter cannot be invoked with default parameter values,
> because it dies like so:
> bin/mahout seqdirectory -i input -o output -filter
> org.apache.mahout.text.SequenceFilesFromCsvFilter
> ...
> Caused by: java.lang.NumberFormatException: null
> at java.lang.Integer.parseInt(Integer.java:417)
> at java.lang.Integer.parseInt(Integer.java:499)
> at
> org.apache.mahout.text.SequenceFilesFromCsvFilter.<init>(SequenceFilesFromCsvFilter.java:56)
> If one adds the parameters -kcol 0 -vcol 0 (or their long-form versions), it
> dies like so:
> Unexpected -kcol while processing Job-Specific Options
> Commenting out SequenceFilesFromCsvFilter:56 and
> SequenceFilesFromCsvFilter:57, like so, allows the run to proceed
> // this.keyColumn = Integer.parseInt(options.get(KEY_COLUMN_OPTION[0]));
> // this.valueColumn =
> Integer.parseInt(options.get(VALUE_COLUMN_OPTION[0]));
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