Lol, no one really. Just a few obscure organizations like NASA, Apple, Pud's DistroKid/Fandalism, Intel, AT&T, and tons of others. Oh and railo is a java framework, who uses java!? Its 2013!
Just like Coldfusion, many people have been saying Java is so 1995 but since Twitter showed how well Java scales compared to the woeful RoR it is seeing a renaissance. And since Railo is a Java framework that speeds development I have a feeling we will being seeing it experience a similar renaissance in the near future.