all java frameworks suck. Hidden too much, concepts too much, config too much, dependencies too much, memory consumed too much, development circle too long, startup too slow.
that is why golang is born.
(I know this comment will be downvoted, but it is the reality, NEVER USE JAVA TO DEVELOP YOUR WEBSITE!)
spring-boot is awesome, the configuration is simple, the development is absolutely quick and easy and startup takes just 3 to 4 seconds on my mac. Seriously you just don't know what you're talking about.
And for that matter I really appreciate Go and its simplicity.
Don't you know the difference between the startup of an application container (which takes 3-4 seconds) and a page refresh which depends on what your application is doing?
There are a lot of companies using Spring, at least in Europe I can't count them. I don't know on what planet you're living :)
Java and spring are everywhere. I think you'd be (unpleasantly?) surprised just how often you're using websites that are running on top of Java and you just didn't know it.
The list just goes on and on. It's fast (okay maybe not as fast as carefully hand-rolled C++, but used the right way it can get near to it), has lots of mature tooling, and most importantly of all is absurdly stable.
If you're worried about start up time, you're likely worrying about the wrong thing. Amazon, for example, is well known to scale up and down their infrastructure on demand, and yet they're running on Java. They wouldn't do that if application start-up time was a problem.
It's rare to see java applications that take more than 5-10 seconds to start up unless they're insanely monolithic and pulling in large numbers of libraries (aka enterprise stacks like Websphere), and once they're running you leave them running.
Java start up time should be the shortest part of the whole 'spin up a new instance and start handling requests'.
that is why golang is born.
(I know this comment will be downvoted, but it is the reality, NEVER USE JAVA TO DEVELOP YOUR WEBSITE!)