I have just been updating the Groovy that comes with Grails 1.1 to Groovy 1.6.1 - and found out that there is a whole heap of Swing and Ant stuff in the file. Given this gets uploaded with your war file, this seems pretty silly. I am sure the Ant stuff gets used in Grails with Gant, but Swing?
There must be a way of getting a swingless Groovy. Useful for Griffon, but clearly not for Grails.