CODEWITHSUNDEEP
androidkotlinretrofitcoroutine
Hemendra Gangwar
Hemendra Gangwar

Reputation: 511

java.lang.ClassNotFoundException: Didn't find class "kotlinx.coroutines.experimental.Deferred"

I am facing this issue when using coroutine with retrofit, can you please let me know why i am getting this error

java.lang.ClassNotFoundException: Didn't find class "kotlinx.coroutines.experimental.Deferred" on path: DexPathList[[zip file "/data/app/com.coroutines.retrofit.kotlin-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]

while i am using the below dependencies,

implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-experimental-adapter:1.0.0'

implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.0.1' implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.1'

and the kotlin version is : ext.kotlin_version = '1.3.10'

Upvotes: 9

Views: 10455

Answers (3)

frynet
frynet

Reputation: 11

it works: (pay attention to jar task)

plugins {
    application
    kotlin("jvm") version "1.6.10"
}

group = "org.example"
version = "1.0-SNAPSHOT"

application {
    mainClass.set("org.example.MainKt")
}

repositories {
    mavenCentral()
}

dependencies {
    implementation("io.ktor:ktor-client-core-jvm:1.6.7")
    implementation("io.ktor:ktor-client-cio-jvm:1.6.7")
}

tasks {
    jar {
        manifest {
            attributes["Main-Class"] = application.mainClass
        }

        duplicatesStrategy = DuplicatesStrategy.EXCLUDE

        configurations.compileClasspath.get().forEach {
            from(if (it.isDirectory) it else zipTree(it))
        }
    }

    compileKotlin {
        kotlinOptions.freeCompilerArgs += "-opt-in=kotlin.ExperimentalStdlibApi"
        kotlinOptions.jvmTarget = JavaVersion.VERSION_1_8.toString()
    }
}

Upvotes: 1

Rainmaker
Rainmaker

Reputation: 11110

I am facing the same problem, it is the Jake Warton's library problem. It is using experimental references internally.

Using implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-experimental-adapter:1.0.0'

java.lang.NoClassDefFoundError: Failed resolution of: Lkotlinx/coroutines/experimental/Deferred;
    at com.jakewharton.retrofit2.adapter.kotlin.coroutines.experimental.CoroutineCallAdapterFactory.get

This library is deprecated . Here is the solution from the library's page on git

This library is deprecated. Please migrate to Retrofit 2.6.0 or newer and its built-in suspend support

Upvotes: 2

Shweta Chauhan
Shweta Chauhan

Reputation: 6981

Add this dependency in your build.gradle : (remove experimental dependency for coroutine)

dependencies {
    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.0.0'
    implementation 'com.jakewharton.retrofit:retrofit2-kotlin-coroutines-adapter:0.9.2'
}

And add CoroutineCallAdapterFactory() for retrofit

addCallAdapterFactory(CoroutineCallAdapterFactory())

Upvotes: 14

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