It would be so great to have some way of global di...

# serialization

[Paul Woitaschek]

It would be so great to have some way of global discovery. I now have about 70 occurences in my project of `

@Serializable(with = LocalDateSerializer::class)

[crummy]

I tried to fix that with this, with ktor:

install(ContentNegotiation) {
        json(module = serializersModuleOf(LocalDate::class, LocalDateSerializer))
    }

coulddn't get it to work though.

[bartvh]

Would be great indeed, though I can imagine it's a complex subject to get exactly right (if there even is a definition of right that everybody can agree on).
However, are you aware of https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/custom_serializers.md#useserializers-annotation ? This might alleviate some of your pain.
I suppose it would help if Kotlin could also support annotations at the package or directory level.

[Paul Woitaschek]

The file annotation doesn't work with library classes and still reports an error.
At runtime it works but the ide is filled with errors.
And registering such a module would still need me to suppress the warnings

[bartvh]

The linked paragraph specifically uses the library class java.util.Date as example, is it not working as intended? What kind of error do you get?

[Paul Woitaschek]

That's no library class

[bartvh]

Then what do you mean by library class?

[Paul Woitaschek]

I.e. threeten LocalDate

[Paul Woitaschek]

It doesn't work if the serializer is in another Gradle module

[bartvh]

But what is the error you get?

[Paul Woitaschek]

"Serializer has not been found for type LocalDate..."

[Paul Woitaschek]

message has been deleted

[bartvh]

This compiles fine for me:

@file:UseSerializers(HostAndPortSerializer::class)
package x.y.z
data class Endpoint(val hp: HostAndPort)

[bartvh]

HostAndPort being from Google Guava, and HostAndPortSerializer defined in another module. Using Kotlin 1.3.31.

[bartvh]

No IDEA warnings either, in 2020.1.1

[bartvh]

Oh wait I forgot the Serializable Still works

[Paul Woitaschek]

It compiles fine for me too, ist just full of ide warnings

[Paul Woitaschek]

And your serializer is for sure in another module?

[bartvh]

Yes, but it's not an Android project. I don't know too much about Android, but I believe the Gradle setup can get quite complex? Perhaps the IDE cannot handle it

[bartvh]

In any case, that's something for the serialization developers. I'm just another user. As far as I can see, you're using it correctly

[Paul Woitaschek]

Got it reproducible

[Paul Woitaschek]

https://github.com/PaulWoitaschek/SerializationBug/blob/master/app/src/main/java/com/example/serializationbug/Test.kt

[Paul Woitaschek]

I'll report tomorrow with some additional ideas

[Paul Woitaschek]

https://github.com/Kotlin/kotlinx.serialization/issues/829

[Paul Woitaschek]

And I opened a feature request on suppressing warnings for specific classes through a compiler flag:
https://github.com/Kotlin/kotlinx.serialization/issues/831