This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
In my experience, no mainstream web framework makes creating RESTful applications easier than Rails does, regardless of language.
That's not to say that REST in Rails is perfect, by any stretch - there are still several places in which it is lacking. Roy Fielding himself, however, has stated that Rails has the best support for RESTful principles of any major framework available.
Of course, this isn't to say that any given person will find developing RESTful applications in Rails easier than it is in Java. The implicit assumption in my statement is that given developers of equal expertise with their framework, the Rails application will come together faster and more easily.