See <https://builds.apache.org/job/kafka-trunk-jdk9/52/display/redirect?page=changes>
- Build failed in Jenkins: kafka-trunk-jdk9 #49 Apache Jenkins Server
- Build failed in Jenkins: kafka-trunk-jdk9 #50 Apache Jenkins Server
- Build failed in Jenkins: kafka-trunk-jdk9 #... Apache Jenkins Server
- Jenkins build is back to normal : kafka... Apache Jenkins Server
