Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/5780
The `ClassLoaderITCase` fails on Travis. There are also checkstyle
violations:
```
10:04:01.988 [ERROR]
src/test/java/org/apache/flink/test/classloading/ClassLoaderITCase.java:[62,15]
(imports) UnusedImports: Unused import: org.junit.Assert.assertEquals.
10:04:01.988 [ERROR]
src/test/java/org/apache/flink/test/classloading/ClassLoaderITCase.java:[65,15]
(imports) UnusedImports: Unused import: org.junit.Assert.fail.
```
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