A build failure was reported, whose root cause is that the central...

A build failure was reported, whose  root cause is that the central (http://repo2.maven.org/maven2/javax/mail/mail/1.4/mail-1.4.pom) and the source of the repository (http://maven.glassfish.org/content/groups/public/javax/mail/mail/1.4/mail-1.4.pom) have different POMs. So if your local repository was pre-populated with JavaMail from central you get this error.

Relaxing a rule a bit.

Also see https://github.com/cloudbees/maven-license-plugin/pull/1