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kotlinlang

So we have `@JvmSynthetic` to hide Kotlin functions from Java users, however, we have no equivalent `@JvmOnly` (or whatever it would be named) to hide definitions from Kotlin. I tried `@Deprecated("Java only", level = HIDDEN)` but it's hidden in Java afterwards as well if you use IntelliJ. :stuck_out_tongue: Any known workarounds for this or is a feature request the only possible thing?

<https://twitter.com/ArtemChubaryan/status/1197644375443955712>

```@Suppress("ILLEGAL_KOTLIN_VERSION_STRING_VALUE")
@SinceKotlin("Java only")```
Seems to be clearer, the suppression can be added as `@file:` too.

You might be able to create your own annotation. `@JvmOnlyJava`

Otherwise, I'd also use the "Java only" version approach.

I know it's unlikely this code will still be around when Kotlin 99999 is released, but...

Sadly no, the `@SinceKotlin` annotation is not inheritable. Meaning, if I create a `@JavaOnly` annotation I cannot give it the same semantics as `@SinceKotlin("Java only")` has it and the symbol will be visible in both Java and Kotlin. :disappointed: I'll create a feature request and PR for Kotlin, we need this. Maybe something like `@PlatformOnly` since it might be useful for JS and native too.

Just wanted to write tests in Kotlin with `@SinceKotlin("Java only")` but the symbols are still visible, it has to be `@SinceKotlin("999999.999999")` or similar (so a version string). :disappointed: I guess the only workaround here is to create a constant that says `JAVA_ONLY` and contains such a weird number.

<https://youtrack.jetbrains.com/issue/KT-36439>

Are we deliberately creating our own Y2k here? :smile:

The reasoning for why devs implemented things as they did that ultimately lead to Y2k were totally sound. Same here. :wink: :smile: