Hi! I'm new at Ktor and kotlinx.serialization so ...

# ktor

[CLOVIS]

Hi!

I'm new at Ktor and kotlinx.serialization so this may be a very dumb question, sorry if that's the case...

I'm trying to setup a multiplatform client to access some REST API. My example is an endpoint (/account/auth/) which I should send a JSON object to, which contains a field username and a field password. It should return a JSON object that contains a token field.

I want to use Kotlinx.Serialization to generate the JSON objects, so I started with:

@Serializable
private data class ApiUsernamePassword(val username: String, val password: String)

and I do my request like this:

val client = HttpClient() {
    install(JsonFeature) {
        serializer = KotlinxSerializer()
    }
}

val res = <http://client.post|client.post><String> {
    url("<http://localhost:8000/account/auth/>")

    body = ApiUsernamePassword(username, password)
}

On the JVM, I get this error:

Companion
java.lang.NoSuchFieldError: Companion
	at io.ktor.client.features.json.serializer.KotlinxSerializer.<init>(KotlinxSerializer.kt:22)

(I can send the full stacktrace if needed)

On JS, I get this error:

TypeError: Cannot read property 'plain' of undefined

    at new KotlinxSerializer (<http://localhost:9876/absolute/[REDACTED]/adapter-browser.js?fb6a5f1e12e8cc2bf794189b2b55f22def38ca94:157371:29>)

I've tried Googling it but I don't get any meaningul/related results for both of those errors... Did anyone encounter this before? I also tried adding an empty companion object to my serializable class but it didn't change anything. (all of the above is in the common module, if that's relevant)

[gabin]

What version of ktor & serializable do you use?

[CLOVIS]

Kotlin 1.3.70
Ktor 1.3.1
Serialization 0.20.0

[gabin]

serialization 0.20.0 is not yet supported. Try 0.14.0

[gabin]

and kotlin 1.3.61

[CLOVIS]

Ok, I'm trying

[CLOVIS]

With your version changes I get (on the JVM):

Fail to send body. Content has type: class net.wildfyre.lib.ApiUsernamePassword (Kotlin reflection is not available), but OutgoingContent expected.

[ribesg]

Add contentType(ContentType.Application.Json) before body = …

[CLOVIS]

@ribesg @gabin It works, thanks a lot!