Ola’s new book, Practical JRuby on Rails, is out sooner than I expected. I’m not going to write a review of it since I was a technical reviewer, but let me recommend it to you. This is the first book out there about JRuby, it’s got great coverage of integrating Ruby and Java in enterprise settings, and it’s by one of the core JRuby developers. What more could you ask for?
It’s too early for other reviews to be out there yet, but I think it’s a winner.