Github user ash211 commented on the issue:
https://github.com/apache/spark/pull/19217
```
========================================================================
Running Java style checks
========================================================================
Using `mvn` from path: /home/ubuntu/spark/build/apache-maven-3.5.0/bin/mvn
Checkstyle checks failed at following occurrences:
[ERROR] src/main/java/org/apache/spark/launcher/LauncherServer.java:[238]
(regexp) RegexpSingleline: No trailing whitespace allowed.
[ERROR] src/main/java/org/apache/spark/launcher/LauncherServer.java:[247]
(regexp) RegexpSingleline: No trailing whitespace allowed.
[error] running /home/ubuntu/spark/dev/lint-java ; received return code 1
```
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