Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/621#issuecomment-96953776
Unfortunately, Travis cuts of the log if it is too long, like here:
https://travis-ci.org/aljoscha/flink/jobs/60177866 (that's from your pull
request). You have to click on the "Download log" button, then you can view the
whole log, there you see the check style errors.
You can also see the errors if you run a "mvn clean verify" on your local
machine.
It seems your code still contains tabs. (From the recently failed travis
builds)
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