Github user zentol commented on the issue:
https://github.com/apache/flink/pull/3941
@greghogan Do we have a checkstyle rule for an empty line before the
package declaration? I saw you added a commit for it, but couldn't find the
corresponding checkstyle rule.
Travis is also failing at the moment due to a checkstyle violation:
```[ERROR]
src/test/java/org/apache/flink/streaming/util/OperatorSnapshotUtil.java:[51]
(regexp) RegexpSingleline: Trailing whitespace```
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