See https://issues.apache.org/jira/browse/LEGAL-570 I have already done it for XMLBeans. I have updated POI too but the windows builds are failing in CI. The reason is the new gradlew and wrapper.gradle files that I borrowed from Apache Kafka do not support Windows. I am working on a Windows solution.
Seems like our src zip/tgz exclude the gradle wrapper files. Not ideal to have them in svn repo but it's more important not to have them in source downloads. I've added back the gradlep-wrapper jar (in svn repo) to fix windows CI builds.