Not too long after Java started to feel tired and worn out, well, as a commodity at least, JRuby has appeared and is making Java hot again. Not hot as a language, but hot as a platform.

It will be very interesting to keep tabs and see which virtual machine (VM) will be the favorite choice for Ruby two years from now. I've heard some criticism of the C-based VM, so perhaps the Java VM has a good chance, or maybe the CLR VM, when it arrives.