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https://issues.apache.org/jira/browse/MAHOUT-913?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163310#comment-13163310
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Lance Norskog commented on MAHOUT-913:
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Eclipse has Checkstyle & PMD available as add-ons.
> Style changes / discussion
> --------------------------
>
> Key: MAHOUT-913
> URL: https://issues.apache.org/jira/browse/MAHOUT-913
> Project: Mahout
> Issue Type: Improvement
> Affects Versions: 0.5
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Minor
> Fix For: 0.6
>
> Attachments: MAHOUT-913.patch
>
>
> Guys I've still been seeing code committed that doesn't match standard Java
> style or a reasonable policy I can imagine. I wanted to talk about it since
> I've just been silently changing it and that is not ideal.
> This should be easy to get right, as automated tools exist to check and fix
> this. I recommend IntelliJ's free Community edition. Flip on even basic
> inspections. A hundred things will jump out (that are already jumping out at
> me). Most are automatically fixable.
> I think that standardized, readable code invites attention, work and care: it
> feels like something you want to improve, and don't want to hack up.
> I think it helps attract committers. Strong engineering organizations
> wouldn't let basic style problems in the codebase, just by using automated
> checks. Code reviews don't begin otherwise, and then reviews focus on real
> issues like design. We can make a basic effort to approach that level of
> quality. Otherwise, people who are used to a higher standard won't be
> inclined to participate in the project, and will just fork.
> I think it's a prerequisite to fixing real design issues, TODOs, correctness
> problems (cloning for instance), and refactorings. This code is not near that
> point, and won't get there at this rate.
> Personally it makes we want to only support anything I've written, and write
> any "next generation" recommender system in a new and separate venture. And
> I'm a friendly, and maybe not the only one! So would be great to keep some
> focus on quality and design.
> Here's a patch showing all the changes I've picked up and made with the IDE
> -- *just* basic style issues, and just since the last 2 weeks. The issues
> are, among others:
> ⁃ Empty javadoc
> ⁃ Redundant javadoc ("@param foo the foo")
> ⁃ Missing copyright headers
> ⁃ Copyright headers not at top of file (sometimes after imports!)
> ⁃ Very long lines (>> 120 chars)
> ⁃ "throws Exception" not on main() or test method
> ⁃ "transient" fields -- should never be used for us
> ⁃ Missing @Override
> ⁃ Using new Random()
> ⁃ Redundant boolean expressions like "foo == true"
> ⁃ Unused variables and parameters
> ⁃ Unused imports
> ⁃ Loops and conditionals without braces
> ⁃ Weird literals ("1d")
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