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https://issues.apache.org/jira/browse/MAHOUT-582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980396#action_12980396
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Hudson commented on MAHOUT-582:
-------------------------------
Integrated in Mahout-Quality #551 (See
[https://hudson.apache.org/hudson/job/Mahout-Quality/551/])
> Add check for empty files passed to FileDataModel constructor in order to
> generate a better error message.
> ----------------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-582
> URL: https://issues.apache.org/jira/browse/MAHOUT-582
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.5
> Environment: Environment neutral.
> Reporter: Donald Bleyl
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.5
>
> Attachments: emptyfile.patch
>
> Original Estimate: 0.08h
> Remaining Estimate: 0.08h
>
> The FileDataModel constructor checks for a null arg for dataFile, and a few
> other conditions, but not for an empty file. If an empty file is passed in,
> it triggers a NullPointerException when the first line is evaluated.
> For an empty file, an NPE is raised when firstLine.length() is called:
> FileLineIterator iterator = new FileLineIterator(dataFile, false);
> String firstLine = iterator.peek();
> while ((firstLine.length() == 0) || (firstLine.charAt(0) ==
> COMMENT_CHAR)) {
> Proposed fix is to add a check for a zero-length file:
> Preconditions.checkArgument(dataFile != null, "dataFile is null");
> if (!dataFile.exists() || dataFile.isDirectory()) {
> throw new FileNotFoundException(dataFile.toString());
> }
> Preconditions.checkArgument(dataFile.length() > 0L, "dataFile is empty");
> A unit test has been included in the patch.
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