Right now I'm getting `ClassCastException` and debugging shows that `line no. 12` does nothing. What...

# announcements

[alex]

Right now I'm getting ClassCastException and debugging shows that line no. 12 does nothing.
What might be the reason, that inline version sometimes (for some calls) skips the cast and returns the same object (i.e. String) instead of reified T?
Classic approach with passing class ref works fine.

Untitled

[alex]

Callsite looks like this:

fun getModel(id: Int: CompletableFuture<Model> {
        val request: HttpRequest = //...
        return sendAsync(request)
    }

[Quy D X Nguyen]

What's your inline declaration?

[alex]

@Quy D X Nguyen can you specify what's that? There is an inline function in code snippet, also I added call-site usage.

[Quy D X Nguyen]

Maybe a bug in the readValue method?

[alex]

Doesn't really seems so:
https://github.com/FasterXML/jackson-module-kotlin/blob/master/src/main/kotlin/com/fasterxml/jackson/module/kotlin/Extensions.kt#L29

But I'll ask about it in Jackson community

[alex]

I guess that problem was that I have a generic over generic type parameter and reified cannot handle this correctly.
Solution I came up with:

protected inline fun <reified T> sendAsync(
        request: HttpRequest,
        typeReference: TypeReference<T> = jacksonTypeRef()
    ): CompletableFuture<T> {
        return client.sendAsync(request) { _ ->
            BodySubscribers.mapping(BodySubscribers.ofString(StandardCharsets.UTF_8)) {
                mapper.readValue(it, typeReference)
            }
        }.thenApply { it.body() }
    }

looks the same, but instead of simple reified T, I'm handing over TypeReference as well.

[alex]

It pretty much looks like this: https://youtrack.jetbrains.com/issue/KT-22798 , so I think it's a bug?