The Java Platform is state-of-the-art in compilation technology, GC, and monitoring/management; nothing else comes close on almost any one of those, and certainly not on all of them combined. The alternatives you mentioned are all "good enough" for some use cases, but are technologically years behind the JVM. Some people are fine driving a Hyundai, but others want to drive a Ferrari. Besides, if you need to write some serious software that has to be performant and manageable and that you're going to need to depend on for years and years, there really aren't that many alternatives. That's why Amazon and Netflix and Google and Apple and Twitter choose Java to run all/most/many of their backend. Such large companies tend to use Java more on new projects as they grow (that's the case with Facebook and GitHub).

It is true that for smaller, less demanding software, there are many alternatives, but except for a very short period (~2000-2005) Java never dominated that kind of software. Early on people used VB, FoxPro and Delphi for that stuff, and later PHP, Python and Node.