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How do I set the jvm target for android studio using gradle and kotlin?

I get the following error when trying to compile a unit test written in kotlin.

Task :app:compileDebugUnitTestKotlin FAILED ...Cannot inline bytecode built with JVM target 1.7 into bytecode that is being built with JVM target 1.6. Please specify proper '-jvm-target' option

I've tried setting the source compatibility for my android configuration in my app build.gradle:

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

as well as configuring all kotlin compile tasks in the root build.gradle:

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
    kotlinOptions {
        jvmTarget = '1.8'
    }
}

9 months ago · Santiago Trujillo

3 Respuestas

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Encuentra empleos remotos

Answer 1 · 2022-05-24T16:05:01.358Z

This is a temporary Android Studio bug. I needed to add these lines to the app's gradle file:

android {
    ...
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }
    kotlinOptions {
        jvmTarget = "1.8"
    }
    ...
}

Answer 2 · 2022-05-24T16:05:01.367Z

1)On a Mac

Android Studio -> Preferences -> Kotlin Compiler -> Change Target JVM version

2) PC

Android Studio -> File -> Settings -> Kotlin Compiler -> Change Target JVM version

Answer 3 · 2022-05-24T16:05:01.374Z

The default target JVM bytecode is 1.6. But this can be set by changing build.gradle(:app):

android{
...
    kotlinOptions {
        jvmTarget = 1.8
    }
}

It seems, the Android Studio Kotlin compiler target JVM option does not work.