Hey folks, after upgrading my multiplatform projec...

# multiplatform

[Tobi]

Hey folks, after upgrading my multiplatform project to kotlin 1.3.20 and ktor 1.1.2 I am running into this exception when running my tests under common/androidTest.

The problem just occurs when running the tests.

java_lang_NoClassDefFoundError__io_ktor_client_features_json_JsonFeature.txt

[Tobi]

These are my dependencies:

kotlin {
targets {
fromPreset(presets.android, ‘android’)

// Change to presets.iosArm64 to deploy the app to iPhone
fromPreset(presets.iosX64, ‘iOS’) {
compilations.main.outputKinds(‘FRAMEWORK’)
}
}
sourceSets {
commonMain {
dependencies {
implementation ‘org.jetbrains.kotlin:kotlin-stdlib-common’
implementation “org.jetbrains.kotlinxkotlinx coroutines core common$coroutines_version”
implementation “org.jetbrains.kotlinxkotlinx serialization runtime common$serialization_version”

implementation “io.ktorktor client core$ktor_version”
implementation “io.ktorktor client json$ktor_version”
}
}
commonTest {
dependencies {
implementation ‘org.jetbrains.kotlin:kotlin-test-common’
implementation ‘org.jetbrains.kotlin:kotlin-test-annotations-common’
}
}
androidMain {
dependencies {
implementation ‘org.jetbrains.kotlin:kotlin-stdlib-jdk8’
implementation “org.jetbrains.kotlinxkotlinx coroutines core$coroutines_version”
implementation “org.jetbrains.kotlinxkotlinx serialization runtime$serialization_version”

implementation “io.ktorktor client core jvm$ktor_version”
implementation “io.ktorktor client json jvm$ktor_version”
implementation “io.ktorktor client okhttp$ktor_version”
}
}
androidTest {
dependencies {
implementation ‘org.jetbrains.kotlin:kotlin-test’
implementation ‘org.jetbrains.kotlin:kotlin-test-junit’
api “io.ktorktor client mock jvm$ktor_version”
implementation “com.nhaarman.mockitokotlin2mockito kotlin2.1.0”
implementation “org.mockitomockito inline2.22.0"
}
}
iOSMain {
dependencies {
implementation “org.jetbrains.kotlinxkotlinx coroutines core native$coroutines_version”
implementation “org.jetbrains.kotlinxkotlinx serialization runtime native$serialization_version”

implementation “io.ktorktor client ios$ktor_version”
implementation “io.ktorktor client core native$ktor_version”
implementation “io.ktorktor client json native$ktor_version”
}
}
}

[Tobi]

For some reason io.ktor.client.features.json.JsonFeature cannot be resolved which should be included in ktor-client-json

[Sabrina Namur]

Did you update kotlinx serialization too? It is required because to binary compatibility issues.

[Tobi]

I am using 0.10.0 for kotlinx serialization and besides the test everything works fine.

ext.kotlin_version = ‘1.3.20’
ext.ktor_version = ‘1.1.2’
ext.serialization_version = ‘0.10.0’
ext.coroutines_version = ‘1.1.1’

[Tobi]

I digged a bit deeper into this and realized I can reproduce it also just with kotlinx/serialization/json/Json.

Furthermore I isolated the issue into this example repository: https://github.com/tobiasheine/Kotlin-Multiplatform-java.lang.NoClassDefFoundError

just run ./gradlew :common:test to reproduce the java.lang.NoClassDefFoundError.

Any help would be much appreciated 🙏