Scala build error on Java 11 using intellijidea

Question

When I build my project from IntellijIdea I get the following errors

Error:scalac: 'jvm-11' is not a valid choice for '-target'
Error:scalac: bad option: '-target:jvm-11'

I am using gradle to build my project. My project is using java 11 and scala 2.12.8.

Can someone help me resolve this error?

Answer 1

Scala 2.12 doesn't support JVM 11 as a target. You need to add this to your gradle build file:

tasks.withType<ScalaCompile> {
    targetCompatibility = "1.8"
}

As for Scala 2.13, the fix for this issue is:

tasks.withType<ScalaCompile>() {
    targetCompatibility = ""
    scalaCompileOptions.additionalParameters = listOf("-target:11")
}