Android Studio throws build error in Kotlin project which calls static method in java interface

Question

I have a Kotlin project in Android Studio. I am calling a static method in Java interface from the Kotlin code. The build fails with the error,

Calls to static methods in Java interfaces are prohibited in JVM target 1.6. Recompile with '-jvm-target 1.8'

I have the following in my build.gradle,

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

I have also changed the Target JVM version to 1.8 in Kotlin compiler settings. Still, the build throws the error. Also tried Invalidating cache and restarting.

Android Studio version: 3.0.1

Answer 1

The compileOptions section in build.gradle affects the Java compiler, not the Kotlin compiler. To set the target JVM version for the Kotlin compiler, use the following block:

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

See the documentation for more information.