Easy step through debugging of core

Anybody know an easy way to hook up jruby core for step through
debugging of jruby’s core through, say, the file “test_io.rb”?

I have had success getting netbeans to build it, but not run anything
from its build.
Thanks.
-r

perhaps this post can help you

Leonardo Borges | helping the jruby effort debugging the source

Thanks that worked a champ.