Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/20175
@gatorsmile . Could you check Java style, too?
```
$ dev/lint-java
Using `mvn` from path: /usr/local/maven-3.5.2/bin/mvn
Checkstyle checks failed at following occurrences:
[ERROR]
src/main/java/org/apache/spark/launcher/InProcessAppHandle.java:[20,8]
(imports) UnusedImports: Unused import - java.io.IOException.
[ERROR]
src/test/java/test/org/apache/spark/sql/JavaDataFrameSuite.java:[464] (sizes)
LineLength: Line is longer than 100 characters (found 102).
```
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