[vbezhenar]

That's a theory not happening in practice. In practice Java programs are slow and memory-hungry because of those issues when some people think that it's cheap to create small objects or that escape analysis will solve their issues without verifying that it works for their case.

[kaba0]

Most of the world’s server applications would like to disagree with you.

[slver]

Java isn’t perfect. But you underestimate the amount of software written in it. Or even things like Python and JS which are a lot more basic but have similar elements in regards to their memory model. What do you use?

[vbezhenar]

I work as Java developer for the last 10 years, I perfectly understand the amount of software and other things.

I don't know much about Python and JS, but I do know that they're not using immutable model, everything is mutable in Python and in JS, so I'm not sure what's your point. The only immutable language I'm aware of is Haskell which is not used widely. Just because JVM is faster than Python or V8 does not mean that it's OK to slow it down with immutables.

[slver]

Using immutables doesn’t mean you go full Haskell. Strings are also immutable you know.