See <https://builds.apache.org/job/Ant-Build-Matrix/./jdk=JDK%201.6%20(latest),label=Ubuntu/456/changes>
- Jenkins build is unstable: Ant-Build-Matrix » JDK 1.... Apache Jenkins Server
- Jenkins build is still unstable: Ant-Build-Matr... Apache Jenkins Server
- Jenkins build is back to stable : Ant-Build... Apache Jenkins Server