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

Question

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'     } } 

Answer 1

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"     }     ... }