jenkinsci/gradle-plugin — pull request #17 by rbywater (2013-06-11 11:12:33+00:00)
Title: Update parent version in pom.xml to allow builds in OpenJDK

Parent version 1.409 doesn't compile with OpenJDK so would be good to update the parent version to allow that. I believe (from my internet searches) that 1.420 is the version that fixed the issue but that then causes a warning about a missing plugin hence the slightly higher version.