Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/12980#issuecomment-217932005
> Currently, Java Linter is disabled due to lack of testing resources.
FYI. This is not correct. The problem is `mvn checkstyle` requires that the
artifacts has been published to some place. Since we publish nightly snapshots
every day, `mvn checkstyle` works most of the time. However, when we upgrade
the version in pom.xml or add some new projects, it requires a manual maven
publish. Otherwise, `mvn checkstyle` will fail by maven resolution problem.
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