[jira] [Created] (SPARK-9534) Enable javac lint for scalac parity; fix a lot of build warnings, 1.5.0 edition

["Sean Owen (JIRA)" <ji...@apache.org>]

Sean Owen created SPARK-9534:
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             Summary: Enable javac lint for scalac parity; fix a lot of build warnings, 1.5.0 edition
                 Key: SPARK-9534
                 URL: https://issues.apache.org/jira/browse/SPARK-9534
             Project: Spark
          Issue Type: Improvement
          Components: Build
            Reporter: Sean Owen
            Assignee: Sean Owen
            Priority: Minor


For parity with the kinds of warnings scalac emits, we should turn on some of javac's lint options. This reports, for example use of deprecated APIs and unchecked casts as scalac does.

And it's a good time to sweep through build warnings and fix a bunch before the release.

PR coming which shows and explains the fixes



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