Github user srdo commented on the issue:
https://github.com/apache/storm/pull/2135
+1
The check goal doesn't currently support "plain" output, the documentation
is wrong.
http://svn.apache.org/viewvc/maven/plugins/tags/maven-checkstyle-plugin-2.17/src/main/java/org/apache/maven/plugin/checkstyle/CheckstyleViolationCheckMojo.java?view=markup#l556
It's because the plugin writes the checkstyle results to disk, then parses
them back up again to figure out if there were any rule violations so it can
fail the build. The parsing code only understands XML.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
