I’ve been having some issues updating to Ktor client 3 on Android. I keep getting this error, but if...

# ktor

[blakelee]

I’ve been having some issues updating to Ktor client 3 on Android. I keep getting this error, but if I downgrade it, it works fine. I’ve tried clearing all of my gradle caches and rebuilding.

Caused by: java.lang.ClassNotFoundException: Didn't find class "io.ktor.client.plugins.contentnegotiation.ContentNegotiation"

Has anyone else been seeing this?

[sigmadelta]

Did you also add io.ktor:ktor-client-content-negotiation to your dependencies (with the same version)?

[blakelee]

Yup, I added it in every module where it's being used and as an api rather than implementation. It's so weird that version 3 breaks it

[sigmadelta]

I'm on 3.0.0-rc-1 right now and not experiencing any dependency issues to be fair.

[Aleksei Tirman [JB]]

Can you please share the full stack trace? Can you check that you don't mix Ktor 2.* and 3.* in the project?

[blakelee]

Good callout. I just realized that it’s an external dependency that’s using ktor 2 and my project is using ktor 3.

[Rafs]

I've also been seeing this same error. When I try tu build a release version of my android app, ContentNegotiation comes up in the missing_rules of proguard

[blakelee]

For me it was happening because supabase kotlin was using an old version of ktor. In the build issues does it show another library failing to create a class?

[Rafs]

It's the same for me, one of the libraries i was depending on used an old version of ktor.