what's the secret to paste-convert java to kotlin?

Just copy and paste, usually it works like that

in what situations won't it work? maybe should have not included the comments // at the top of the java code?

no, I had it when copy-paste from Kotlin file %)

ok I guess I won't worry about it, probably just this one file.. yeah I did that already and it worked, basically the same except the file contained the package line

Yeah in intellij it's under code tab at the very bottom