Is Rcov compatible with Jruby now?

Hello everyone:
  I am currently assigned to test a big project which uses JRuby to build a web application. The reason of using JRuby is the web application is communicating with Java Service. I am writing test cases using Rspec and looking for a code coverage tool. Rcov is no doubt a nice code coverage tool. However, it is said that Rcov is not compatible with JRuby so far. Sigh....I can not find any other code coverage tools for JRuby. Some developers are working on this problem. So I am wondering whether there are any progresses so far? Or are there any alternative code coverage tools for JRuby?