1. is it a better framework than spring boot
Dropwizard has a refreshing approach.
2. is it a better tooling like heroku or something for java
Working with kubernetes is seamless. Lots of ready made hooks to your JVM and your application
3. is it better community & programming paradigms ? I once asked a question "can i write a java api using all variables as public" and got flamed pretty badly. Do people want an alternative to the MVC/DAO/DTO structure ...where the community doesnt flame them ?
There is a strong push toward immutable everything and final all variables. It's ugly like often with java, but it's attainable by settings the linter to the max and adding yet another annotation ( to the package folder itself, and it's not enforced by the compiler unless you ask for it... )
4. is it something else ?
At this point I can crank out things fast in functional & immutable manner. Tests write themselves. JVM is rock solid.