See <https://builds.apache.org/job/OpenJPA-2.4.x/org.apache.openjpa$openjpa-persistence-jdbc/8/>
- Jenkins build became unstable: OpenJPA-2.4.x » Open... Apache Jenkins Server
- Jenkins build is still unstable: OpenJPA-2.4.x ... Apache Jenkins Server
- Jenkins build is still unstable: OpenJPA-2.... Apache Jenkins Server
- Jenkins build is back to stable : OpenJ... Apache Jenkins Server