R-ruby-exceptor is a project mainly written in RUBY and R, it's free.
Proper exception handling when calling R methods from Ruby using rsruby
Getting a full strack trace for R exceptions can be tricky when calling R methods from Ruby.
Calling R methods using rsruby and this library gives you exceptions with:
Error message generated by R. Full R stack trace with file names and line numbers. Full Ruby stack trace.
See test.rb and test.r for a usage example.
-- Juul