This is probably a layer 8 problem but I m stumped I m attem | Serialization | Kotlinlang

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b

bendb

2 years ago

This is probably a layer 8 problem, but I'm stumped. I'm attempting to use kotlinx.serialization without taking a kotlin-reflect dependency in a multiplatform project. I'm trying to do a basic sanity check in a JVM unit test that this works, but am getting a

NoClassDefFoundError

in

Json.<clinit>

, which is indirectly trying to look up

KPackage

, a kotlin-reflect type. The test passes if I add a

kotlin-reflect

dependency. Is it the case that json support requires kotlin-reflect?

stack trace showing the error:

kotlin/reflect/KPackage
java.lang.NoClassDefFoundError: kotlin/reflect/KPackage
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:264)
	at kotlin.jvm.internal.Reflection.<clinit>(Reflection.java:26)
	at kotlinx.serialization.json.JsonKt.<clinit>(Json.kt:216)
	at kotlinx.serialization.json.Json.<init>(Json.kt:63)
	at kotlinx.serialization.json.Json.<init>(Json.kt:62)
	at kotlinx.serialization.json.Json.<clinit>(Json.kt:160)
...

Nikky

Nikky

2 years ago

can you show code or reproduce in a minimal sample,?also sanitycheck versions of kotlin and serialization and plugins ?

b

bendb

2 years ago

Sure. Kotlin is 1.3.50, serialization is 0.13.0. I'll paste the snippet in a second.

@Serializable
data class BasicData(val eventType: Int)

class SerializationTests {
  @Test
  fun basicTest() {
    Json.stringify(BasicData.serializer(), BasicData(5)) shouldBe """{"eventType":5}"""
  }
}

the error happens before

stringify

is ever called - it's raised during class loading of

kotlinx.serialization.json.Json

Fudge

Fudge

2 years ago

I believe this is a bug that is fixed in the next release https://github.com/Kotlin/kotlinx.serialization/issues/549

b

bendb

2 years ago

I kind of thought so at first, but the responsible code in

Json.kt

hasn't changed.

Nikky

Nikky

2 years ago

i use kotlin 1.3.50 and serialization 0.12.0 and it works fine, not sure why i did not upgrade, but it was one of those bugs

m

Marc Knaup

2 years ago

How did you manage to do that? 😄

KPackage

has been removed in Kotlin 1.0.1 😮 Most likely cause is a rift in the space-time continuum. Did a really old Kotlin dependency sneak in somehow?

j

JoakimForslund

2 years ago

I'm doing the same 😄

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