explicit java version for :core

Author: Jolanrensen

core/build.gradle.kts

@@ -42,13 +42,19 @@ java {
  languageVersion.set(
  JavaLanguageVersion.of(Versions.jvmTarget)
  )
+ } else if (Versions.jvmTarget == "1.8" || Versions.jvmTarget == "8") {
+ languageVersion.set(
+ JavaLanguageVersion.of(8)
+ )
  }
  }
 }
 
 tasks.withType<ScalaCompile> {
  if (Versions.scalaCompat.toDouble() > 2.12) { // scala 2.12 will always target java 8
  targetCompatibility = Versions.jvmTarget
+ } else if (Versions.jvmTarget == "1.8" || Versions.jvmTarget == "8") {
+ targetCompatibility = "1.8"
  }
 }