gistfile1.txt

irb(main):002:0> Net::HTTP.get(URI.parse('http://www.google.com'))
IOError: Function not implemented
        from org/jruby/ext/socket/RubyTCPSocket.java:110:in `initialize'
        from org/jruby/RubyIO.java:1176:in `open'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:762:in `connect'
        from org/jruby/ext/timeout/Timeout.java:105:in `timeout'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:762:in `connect'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:755:in `do_start'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:744:in `start'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:454:in `get_response'
        from /usr/home/jps/.rvm/rubies/jruby-1.7.0/lib/ruby/1.9/net/http.rb:431:in `get'
        from (irb):2:in `evaluate'
        from org/jruby/RubyKernel.java:1065:in `eval'
        from org/jruby/RubyKernel.java:1390:in `loop'
        from org/jruby/RubyKernel.java:1173:in `catch'
        from org/jruby/RubyKernel.java:1173:in `catch'
        from /home/jps/.rvm/rubies/jruby-1.7.0/bin/irb:13:in `(root)'
irb(main):003:0> RUBY_DESCRIPTION
=> "jruby 1.7.0 (1.9.3p203) 2012-10-22 ff1ebbe on Java HotSpot(TM) Client VM 1.7.0_09-b05 [linux-i386]"
irb(main):004:0>

Missing epoll_create support in FreeBSD's linux emulation layer.

if you run an application in the linux java which wants to use the linux epoll functions (you should see "not implemented" messages in dmesg), you can start java with the argument -Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.PollSelectorProvider

ruby -J-Djava.nio.channels.spi.SelectorProvider=sun.nio.ch.PollSelectorProvider -J-Djava.net.preferIPv4Stack=true -S irb