Hence the now on my comment. :)

It's complete but low level compared to Byte Buddy. A better comparison is the to ASM (which is what it was meant to replace).

https://asm.ow2.io/

I have not yet used it, only raising awareness.

This came to be, because Oracle noticed everyone, including themselves, were depending on ASM, so the JEP was born.

Kotlin is fatter, compiler is slower, code completion is slow as hell on large projects, but other than building small applications - there's really no reason to not use kotlin except for the fact that you need to actually learn the language or else you're going to end up with very very slow codebase where opening a file and waiting for syntax highlighting takes 2-3 seconds and typing autocomplete is just painfully slow.