2008/12/4 Thomas Enebo <Thomas.Enebo / sun.com>:
> The JRuby community is pleased to announce the release of JRuby 1.1.6RC1!
>
> Homepage: http://www.jruby.org/
> Download: http://dist.codehaus.org/jruby/
>
> JRuby 1.1.6RC1 is the first release candidate for our sixth point release of
> JRuby 1.1.  The fixes in this release are primarily obvious compatibility
> problems and performance enhancements.  Our goal is to put out point
> releases
> more frequently for the next several months (about 3-4 weeks a release).  We
> want a more rapid release cycle to better address issues brought up by users
> of JRuby.  If we find no major problems with 1.1.6RC1 we will release the
> final
> version of 1.1.6 early next week.
>
> ****Please try your apps against 1.1.6RC1 ASAP and report problems****
>
> Highlights:
> - Additional Ruby 1.9 support (via --1.9)
>  - Full 1.9 parser
>  - Most core 1.9 methods/libraries/classes

Trying to run jirb in 1.9 mode:

    $ bin/jruby --1.9 bin/jirb
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb/extend-command.rb:152:in
`install_alias_method': undefined method `id2name' for nil:NilClass
(NoMethodError)
            from
/home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb/extend-command.rb:179:in
`extend_object'
            from
/home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb/extend-command.rb:178:in
`each'
            from
/home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb/extend-command.rb:178:in
`extend_object'
            from
/home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb.rb:93:in
`initialize'
            from
/home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/irb.rb:59:in
`start'
            from bin/jirb:19

Are these 1.8 directories intentionally in the load path?

    $ bin/jruby --1.9 -e 'puts $LOAD_PATH'
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/site_ruby/1.9
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/site_ruby
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.9
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.9/java
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/site_ruby/1.8
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/site_ruby
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8
    /home/stefan/Ruby/ruby/jruby-1.1.6RC1/lib/ruby/1.8/java
    lib/ruby/1.8
    .

Looking further, there are no 1.9 library directories.
Are they simply missing from the binary release tarball?

Anyway, a big thanks to the JRuby team for the great work!

Stefan