When I start a new KMM project, add `implementatio...

# multiplatform

[adjpd]

When I start a new KMM project, add implementation("org.jetbrains.kotlinx:kotlinx-datetime:0.3.2") to commonMain in my shared module, add Clock.System.now().epochSeconds in my Greeting file, then run the application in Android, it crashes with an error about not finding java.time.Instance.

[adjpd]

Process: com.example.mykmm.android, PID: 2988
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/time/Instant;
 	at kotlinx.datetime.Instant.<clinit>(Instant.kt:94)
 	at kotlinx.datetime.Clock$System.now(Clock.kt:14)
 	at com.example.mykmm.Greeting.greeting(Greeting.kt:7)

[adjpd]

And it does not crash on iOS... 🤷‍♂️

[ephemient]

java.time requires Java 8+, which is not satisfied on most Android versions

[adjpd]

So I need to ensure i'm using java8?

[ephemient]

Android just doesn't have Java 8 (at least, not exactly)

[ephemient]

see https://developer.android.com/studio/write/java8-support-table for how to enable desugaring where the build system rewrites a subset of Java 8 APIs into something that works on older devices

[ephemient]

(by "your code" I mean everything that gets built into the app, which includes kotlinx-datetime if you're using it as a dependency)

[adjpd]

Thanks!

compileOptions {
        isCoreLibraryDesugaringEnabled = true
        sourceCompatibility = JavaVersion.VERSION_1_8
        targetCompatibility = JavaVersion.VERSION_1_8
    }

[adjpd]

And

dependencies {
    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:1.1.5")
}

[adjpd]

Did it for me