ruby 1.8.7 + rubygems
gem install ruby-maven
or jgem install ruby-maven
MRI performs much better due to the fast startup of the interpreter.
that is basically a proper maven with a ruby launcher. on top of it can use a gemspec file or a Gemfile as POM. originally the idea of non-xml POMs is coming from http://github.com/sonatype/polyglot-maven. see https://github.com/sonatype/polyglot-maven/tree/master/pmaven-jruby for more details about the ruby DSL, etc
just starts a jetty server inside a rails application if the Gemfile is suitable for jruby and suitable for maven (gems prereleased version are still a problem). if the Gemfile is suitable then just execute
and you will get an http port on 8080 and an https port on 8443 with selfsigned certifacte for localhost.
this is a helper which allows to setup a rails application with a GWT UI and helps to run some gwt specific commands.
see http://github.com/mkristian/rails-resty-gwt for more details.