You can clone with
With RVM, and maybe other situations, we see this kind of thing:
$ java -jar app.war -S script/rails c
Loading production environment (Rails 3.2.12)
jruby-1.7.4.dev :001 > JRUBY_VERSION
jruby-1.7.4.dev :002 > IRB.conf[:PROMPT_MODE]
Basically, its picks up the RVM .irbrc configuration, which thinks our JRuby runtime is the RVM ruby in use. But actually we are using the JRuby inside of the WAR.