jRuby IO.select fail

gistfile1.rb

# This should print "nada" unless stdin has data.

while true
  i, o, e = IO.select([$stdin], nil, nil, 0)

  if i.include?($stdin)
    c = $stdin.readpartial(1024)
    puts c.inspect
  else
    puts "nada"
  end
end

At the beginning of the execution of this script, there is nothing in $stdin, so this script block on line 7.

If you feed some stuff on $stdin in the beginning, the script will terminate as expected. For example:

[system] gist1292579-ecd3acd88097b7404b1e1b3faae8bfcecad2e8cd [git:master] $ echo "blah" | jruby gistfile1.rb 
"blah\n"
EOFError: End of file reached
  readpartial at org/jruby/RubyIO.java:2533
       (root) at gistfile1.rb:7