Good question. :) Honestly I don't know, though here are the docs for the latest version and there's some installation details there: http://docs.jboss.org/resteasy/docs/2.3.4.Final/userguide/html/
You might pose this question on the mailing list (there's a link at the main resteasy project page - http://www.jboss.org/resteasy/)
Hope that helps!