Yes. But `kotlin.Throwable` isn’t extending `java....

# stdlib

[holgerbrandl]

Yes. But kotlin.Throwable isn’t extending java.lang.Throwable. Also the docs are not too helpful: https://kotlinlang.org/docs/reference/exceptions.html states that

All exception classes in Kotlin are descendants of the class Throwable

but I could not find any example in the stdlib. E.g. see kotlin.KotlinNullPointerException as a counter-example.

[ilya.gorbunov]

Descendants doesn't mean direct descendants.

[ilya.gorbunov]

kotlin.Throwable doesn't have its own runtime representation in JVM and is mapped onto java.lang.Throwable in runtime

[holgerbrandl]

Thanks. So should I then use it as baseclass for my own exception classes instead of jvm exception classes for better crossplatform interop?

[ilya.gorbunov]

Do you use java.lang.Throwable as a base class for exceptions in Java? Usually, no — you peek some more specific exception type and extend it.

[holgerbrandl]

Ok I’ll do so, thanks for your help.

[ilya.gorbunov]

If you want your exceptions to be multiplatform you can choose on of exceptions in `kotlin`: kotlin.Exception, kotlin.Error, kotlin.RuntimeException etc. On JVM these are typealiases to JDK exception classes.