Build failure in Jenkins build of log4j/release-2.x (6)

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There is a build failure in log4j/release-2.x.

Build: https://builds.apache.org/job/log4j/job/release-2.x/6/
Logs: https://builds.apache.org/job/log4j/job/release-2.x/6/console
Changes: https://builds.apache.org/job/log4j/job/release-2.x/6/changes