Not sure if correct, but I'll tell you my point of view. Many people nowadays are programming not in Java, but in Spring. And it is slow, resource intensive and in the long term - development speed is badly affected too. You have simple tutorial service? Easy. You have real business case and want to do something a little bit skewed from "the best way" - you are screwed, in the debugger, deep into Spring code, praying to find workaround.

JVM is fast, but raw Java is not seen so often in corpo-rat world. And if for single endpoint getting data from database and encoding to JSON you have to schedule 2 cores and 4G of RAM for every few hundred QPS - something is wrong.