CODEWITHSUNDEEP
javagradleintellij-ideakotlin
User1291
User1291

Reputation: 8209

Intellij refuses to set the Kotlin target jvm to 1.8?

ParallelStreams.kts:41:15: error: calls to static methods in Java interfaces are prohibited in JVM target 1.6. Recompile with '-jvm-target 1.8'
IntStream.range(0,10).parallel().forEach{a ->
         ^

Ok ... I'm not trying to compile for 1.6.

File > Project Structure > Project has project sdk 1.8 and language level 8.

File > Project Structure > Modules > Kotlin has target platform: JVM 1.8.

File > Project Structure > Facets > Kotlin has target platform: JVM 1.8.

File > Settings > Compiler > Kotlin Compiler has target jvm version 1.8.

My gradle build file ...

plugins {
    id 'org.jetbrains.kotlin.jvm' version '1.3.0'
}

group 'foo'
version '1.0-SNAPSHOT'

repositories {
    mavenCentral()
}

dependencies {
    //kotlin
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
    implementation "org.jetbrains.kotlin:kotlin-script-runtime:1.3.0"

    //networking
    implementation 'com.mashape.unirest:unirest-java:1.4.9'
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

I'm running out of places to check for 1.8.

And yes, I have tried invalidating the cache and restarting Intellij. It does nothing to resolve this issue.

Upvotes: 13

Views: 15808

Answers (3)

Golvanig
Golvanig

Reputation: 41

With .kts just use this: 

tasks {
    withType<KotlinCompile> {
        kotlinOptions.jvmTarget = "1.8"
    }
}

// I am using latest dsl and gradle 
val kotlinVersion = "1.3.30"
val gradleVersion = "5.4+"

Upvotes: 4

Kiskae
Kiskae

Reputation: 25603

Since compilation tasks are generated for all relevant configurations it is likely that just changing compileKotlin and compileTestKotlin isn't enough.

Try using task filtering to configure all KotlinCompile task instances:

tasks.withType(KotlinCompile) {
    kotlinOptions.jvmTarget = "1.8"
}

Upvotes: 1

punchman
punchman

Reputation: 1380

Add sourceCompatibility and targetCompatibility for Java 1.8:

plugins {
  id 'org.jetbrains.kotlin.jvm' version '1.3.0'
}

group 'foo'
version '1.0-SNAPSHOT'

repositories {
  mavenCentral()
}

// Add compatibility
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8


dependencies {
  //kotlin
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
  implementation "org.jetbrains.kotlin:kotlin-script-runtime:1.3.0"

  //networking
  implementation 'com.mashape.unirest:unirest-java:1.4.9'
}

compileKotlin {
  kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
  kotlinOptions.jvmTarget = "1.8"
}

Upvotes: 6

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