hi! i am currently updating to ktor2 and i am movi...

# ktor

[bitkid]

hi! i am currently updating to ktor2 and i am moving from the location API to the resource API. in my URL parameters i used to have a parameter defined like this val format: ImportFormat = ImportFormat.NDJSONLD (where import format is an enum). it was possible to omit the enum parameter in the location API and it just took the default value. now i get the exception Can't transform call to resource with an underlying NPE. any ideas?

[bitkid]

the whole thing looks like this

[bitkid]

@Serializable
@Resource("/api/import-results")
class ImportResultData(
    val resource: String,
    val format: ImportFormat = ImportFormat.NDJSONLD
)

[Rustam Siniukov]

Can you share stacktrace, please?

[bitkid]

https://gist.github.com/bitkid/d6da788850a6b3d8c7c89cec918299fc

[bitkid]

maybe i have to configure the serializer used?

[bitkid]

btw it also doesnt work to make it just nullable val format: ImportFormat?

[bitkid]

stacktrace looks the same

[Rustam Siniukov]

Ok, i reproduced it. Will open PR shortly

[bitkid]

any fast workaround for 2.0.1?

[Rustam Siniukov]

FYI https://github.com/ktorio/ktor/pull/3036

[Rustam Siniukov]

I can’t think of any workaround for now

[bitkid]

i found one .. just write a custom serializer for the enum like this

[bitkid]

https://gist.github.com/bitkid/33bf33b8e25d8340d642d86d7c283924

[bitkid]

and then use

[bitkid]

@Serializable(with = ImportFormatSerializer::class) val format: ImportFormat = ImportFormat.NDJSONLD