Not sure if this is an issue with the Kotlin plugin, or the Gradle Kotlin DSL, or something I'm doing wrong. Any ideas?

Append the following to the build file:

val compileKotlin by tasks.getting(KotlinCompile::class) {
    kotlinOptions.jvmTarget = "1.8"
}
val compileTestKotlin by tasks.getting(KotlinCompile::class) {
    kotlinOptions.jvmTarget = "1.8"
}

Refresh Gradle in Intellij.

That worked, thanks! Did they change the task configuration syntax again? Seems pretty verbose. I'm using the

gradle-4.4-all

distribution.

@breandan The way you originally configured kotlin options to target jvm 1.8 should be enough. If these options aren't imported in IDE properly, please report a bug.

Think it was a stale cache, had to delete the

.idea

folder and

.iml

files and reimport the project from scratch. Thanks!