Grails not downloading plugins

My grails 2.3.8 project is no longer downloading plugins. This has happened in the last few days.

I've set verbose output in BuildConfig.groovy

grails runApp

reports unresolved dependencies:

    module not found: org.grails.plugins#mail;1.0
==== grailsPlugins: tried
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  /Users/greg/Documents/development/git/liftyourgame-grails/webapp/lib/mail-1.0.zip
==== grailsHome: tried
  /Applications/Dev/grails-2.3.8/lib/org.grails.plugins/mail/ivy-1.0.xml
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  /Applications/Dev/grails-2.3.8/lib/org.grails.plugins/mail/jars/mail-1.0.zip
  /Applications/Dev/grails-2.3.8/lib/org.grails.plugins/mail/bundles/mail-1.0.zip
==== grailsHome: tried
  /Applications/Dev/grails-2.3.8/dist/mail-1.0.pom
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  /Applications/Dev/grails-2.3.8/dist/mail-1.0.zip
==== grailsHome: tried
  /Users/greg/.grails/2.3.8/cached-installed-plugins/mail-1.0.xml
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  /Users/greg/.grails/2.3.8/cached-installed-plugins/mail-1.0.zip
==== grailsHome: tried
  /Applications/Dev/grails-2.3.8/plugins/mail-1.0.pom
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  /Applications/Dev/grails-2.3.8/plugins/mail-1.0.zip
==== grailsCentral: tried
  http://grails.org/plugins/grails-mail/tags/RELEASE_1.0/mail-1.0.pom
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  http://grails.org/plugins/grails-mail/tags/RELEASE_1.0/grails-mail-1.0.zip
==== mavenCentral: tried
  http://repo1.maven.org/maven2/org/grails/plugins/mail/1.0/mail-1.0.pom
  -- artifact org.grails.plugins#mail;1.0!mail.zip:
  http://repo1.maven.org/maven2/org/grails/plugins/mail/1.0/mail-1.0.zip

If I download directly

http://grails.org/plugins/grails-mail/tags/RELEASE_1.0/grails-mail-1.0.zip

it downloads fine.

There is no proxy involved. I have also removed .grails and run the command again with the same result.

Solution

This is impacting only older versions of Grails that use the Ivy resolver. See https://stackoverflow.com/a/23594402/259167