Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1689
Now `CHECKSTYLE=1` passes CI.
(https://travis-ci.org/1ambda/zeppelin/jobs/180609577)
But I can't find checkstyle `WARN` log starting with prefix `[WARN]` in
travis CI log for example,
```
[INFO] --- maven-checkstyle-plugin:2.17:check (checkstyle-fail-build) @
zeppelin-example-horizontalbar ---
[INFO] Starting audit...
[WARN]
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-examples/zeppelin-example-horizontalbar/src/main/java/org/apache/zeppelin/example/app/horizontalbar/HorizontalBar.java:17:
'package'should be separated from previous statement. [EmptyLineSeparator]
[WARN]
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-examples/zeppelin-example-horizontalbar/src/main/java/org/apache/zeppelin/example/app/horizontalbar/HorizontalBar.java:25:
Using the'.*' form of import should be avoided -
org.apache.zeppelin.resource.*. [AvoidStarImport]
[WARN]
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-examples/zeppelin-example-horizontalbar/src/main/java/org/apache/zeppelin/example/app/horizontalbar/HorizontalBar.java:65:
First sentence of Javadoc is incomplete (period is missing) or not present.
[SummaryJavadoc]
Audit done.
```
It's due to `-Dorg.slf4j.simpleLogger.defaultLogLevel=warn` options i added
recently to remove verbose `INFO` logs.
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