See <https://builds.apache.org/job/MINA-2.1.X-jdk1.8-ubuntu/org.apache.mina$mina-core/4/display/redirect?page=changes>
- Jenkins build became unstable: MINA-2.1.X-jdk1.8-ub... Apache Jenkins Server
- Jenkins build is still unstable: MINA-2.1.X-jdk... Apache Jenkins Server
- Jenkins build is back to stable : MINA-2.1.... Apache Jenkins Server
