Kernel.trap does not work on MacOS X Lion

I have found a strange behavior when trying to restart rails app. Webrick shows me that default port 3000 is already binded, to restart I need to "ps ax | grep java" and kill -9 this process.

After some googling and researching I have found that JRuby doesn't properly work with Kernel.trap method on my laptop (Mac OS X Lion 10.7.1, rvm 1.7.2, jruby 1.6.3, Java(TM) SE Runtime Environment (build 1.6.0_26-b03-383-11A511c).

Here is some ruby code to test described behavior (some.rb):

Kernel.trap(:INT)

loop do
puts ". "
sleep 1
end

And here is steps to reproduce:

$ rvm use ree
Using /Users/cr0t/.rvm/gems/ree-1.8.7-2011.03

$ ruby some.rb
.
.
^Cinterrupted = true

We can see that block given to the trap method is executed successfully ("interrupted = true" printed out before exiting), so next we will try to run code above via JRuby interpreter.

$ rvm use jruby
Using /Users/cr0t/.rvm/gems/jruby-1.6.3
$ ruby some.rb
.
.
^C

$ rvm version

rvm 1.7.2 by Wayne E. Seguin (wayneeseguin@gmail.com) https://rvm.beginrescueend.com/

Could anyone help to fix this issue (it's really annoying when working with rails)? Or anyone who can reproduce such behavior?