@ahorek seems good but without a test is a little less worthy, any chance you do a test-case or tell us what use-case (sample .rb script) has been failing for you that the change fixes? thanks

@kares - hi, most jruby tests don't work on windows and this is windows specific. Failing scenario is already described in the related issue.

spec/ruby/core/file/realpath_spec.rb
it "returns '/' when passed '/'" do
  File.realpath('/').should == '/'
end

=> for windows it should look something like this:

it "returns '/' when passed '/'" do
  if is_windows?
    File.realpath('/').should == 'C:/' # current behaviour 'C:\'
  else
    File.realpath('/').should == '/' # linux
  end
end

seems good ... @mkristian what do you think of: File.realpath('/').should == 'C:/' # NOT 'C:\'

the usual java vs. ruby paths. yes, this is OK. still a test which passes on windows as on unix would be great. one there we will have a CI running on windows and then it is important that we have a good test coverage for those windows only cases. test/jruby/test_file.rb is also a good place for such a test as this is in jruby direct control.

@mkristian thanks I wasn't sure since its been a while when a tried JRuby on Windows.
shall wait a while if @ahorek decides to add some cases at test/jruby/test_file.rb or merge as is.

@kares - I've added very simple cases, is it ok? this fix should be also backported to JRuby 1.7.23

@ahorek looks good, we're in the process of merging jruby-1_7 into master,
... after we shall merge these and likely even back-port to jruby-1_7. thanks.