Hi folks, I migrated to kotlin 1.5.0 and ktor 1.6.0. I’m using the `native-mt` version of coroutines...

# ktor

[mboudraa]

Hi folks,
I migrated to kotlin 1.5.0 and ktor 1.6.0. I’m using the native-mt version of coroutines 1.5.0.

I have a very simple test that fails on iOS with a kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlin.collections.HashMap@1657db08 and I have no idea where it can come from given the simplicity of this test.

If anyone has any lead, it would be very helpful

Untitled.kt

[mboudraa]

Here is the full stacktrace if it helps

Untitled

[mboudraa]

FYI The same test pass if my data class contains all the keys the json contains

[turansky]

Do you update serialization ?

[turansky]

Do you use latest configuration?
Kotlin 1.5.10
Coroutines 1.5.0
Serialization 1.2.1
Ktor 1.6.0

[mboudraa]

Yes. I just double checked. And it produces the same error

[Robin Hos]

I had the same issue this morning. It is already tracked, (see https://github.com/Kotlin/kotlinx.serialization/issues/1450) and fixed (see https://github.com/Kotlin/kotlinx.serialization/pull/1484), but it isn’t released yet. For me the given workaround to set useAlternativeNames = false worked.

[Henry]

I set useAlternativeNames = false , it’s work

[Henry]

do exact @Robin Hos said

[ptsiogas]

The workaround works fine, should we expect a new Ktor version that won’t require the workaround?