How do replace kotlinx.serialization with jackson again?

# spring

[thana]

How do replace kotlinx.serialization with jackson again?

[thana]

i read in the docs "if Jackson is needed configure KotlinSerializationJsonMessageConverter manually." but i dont get what this means

[thana]

@sdeleuze can you hint me to a solution 🙏

[thana]

ok finally managed to remove kotlinx from our WebClients. but tbh: i want ktolinx.serialization NOWHERE where jackson was used before. is there a way to configure this in one place?

[sdeleuze]

In latest versions this quote is for RSocket only I think https://docs.spring.io/spring-framework/docs/current/reference/html/languages.html#kotlin-multiplatform-serialization.

[sdeleuze]

i want ktolinx.serialization NOWHERE where jackson was used before

I am not sure to understand, you have kotlinx.serialization in the lcasspath but don't want it to be configured or used by WebClient ?

[thana]

correct. not in webclient, not in web controllers, no where

[sdeleuze]

If you wan't that behavior I think you will have to customize codec and converter configuration accordingly. But I am curious about your use case, could you share more?

[sdeleuze]

I am asking since kotlinx.serialization mainly targets @Serializable classes which should not be an issue for most use cases.

[sdeleuze]

Collection of primitive types may end up to be processed as well before Jackson, is that your issue?

[thana]

well today we ran into an issue in the line

.body(Mono.just(data), Set::class.java)

(which inserts the body into a POST requests)
after updateting to spring boot 2.4 (or 2.4.1) it threw
because kotlinx couldnt; find a Polymorphic serializer for Set, or EmptySet or...

[sdeleuze]

Could be a bug, could you please share a repro project?

[thana]

unfortunately its a customer project 😞

[sdeleuze]

Sure but I mean extract the use case in a simple repro.

[sdeleuze]

FYI I can probably fix this but I need an issue with a repro.