How do I get the value of a `const val` property?

# reflect

[ribesg]

How do I get the value of a const val property?

[diesieben07]

Should be the same as a regular val.

[ribesg]

Nope, it crashes with

java.lang.IllegalArgumentException: Callable expects 0 arguments, but 1 were provided.
	at kotlin.reflect.jvm.internal.calls.Caller$DefaultImpls.checkArguments(Caller.kt:20)
	at kotlin.reflect.jvm.internal.calls.CallerImpl.checkArguments(CallerImpl.kt:15)
	at kotlin.reflect.jvm.internal.calls.CallerImpl$FieldGetter.call(CallerImpl.kt:134)
	at kotlin.reflect.jvm.internal.KCallableImpl.call(KCallableImpl.kt:106)
	at kotlin.reflect.jvm.internal.KProperty1Impl.get(KProperty1Impl.kt:35)

[ribesg]

It looks like the KProperty1Impl.get method both requires an argument and crashes when one is provided... Somehow

[ribesg]

Everything works if I remove const, so I'm not blocked, but my question still stands.

[diesieben07]

I am not sure how you got a KProperty1 for a const val. const val can only be top level (KProperty0) or in an object (also KProperty0).

[ribesg]

I'm iterating over declaredMemberProperties which is a Collection<KProperty1<T, *>>. It's an object containing only `const val`s

[ribesg]

Maybe my `const val`s aren't even in this collection

[diesieben07]

Okay, that is definitely a bug.

[ribesg]

Tried to log declaredMemberProperties, they are in there

[diesieben07]

Workaround:

val value = if (prop.isConst) {
    prop.javaField!!.get(null)
} else {
    prop.get(<receiver>)
}

[diesieben07]

But you should definitely file an issue on YouTrack

[ribesg]

https://youtrack.jetbrains.net/issue/KT-23267

[ribesg]

Damnit @diesieben07 I was writing my answer 😛

[diesieben07]

Derp, sorry

[diesieben07]

I thought that was a new issue made by you

[ribesg]

I always look for existing issues before submitting new ones, and there was one. It's kinda old already

[ribesg]

I don't think it's something easy to fix anyway, so I'll use your workaround for at least some months