JVM target error

[avjiang]

Hi, i am facing problem after updated IntelliJ. I also have updated my kotlin version to 1.3.60

IntelliJ IDEA 2019.2.1 (Community Edition)
Build #IC-192.6262.58, built on August 20, 2019
Runtime version: 11.0.3+12-b304.39 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o

Previous version i never face any issue, but in this build, i face this error. Now I am using version 1.8.0

Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6. Please specify proper '-jvm-target' option

FAILURE: Build failed with an exception.

Here is the code in my commonMain folder

var timeZone = TimeSpan((8.hours).milliseconds)

I have changed my project JVM version setting to 1.6.

Is there anything that I have to do to solve this issue? Hopefully you can guide me on this. Thanks!

[soywiz]

I started to use Target JVM version 1.8

[avjiang]

Is there any thing I need to adjust in my side?

[soywiz]

https://kotlinlang.org/docs/reference/using-gradle.html#attributes-specific-for-jvm

jvmTarget = "1.8"

If you are using multiplatform:
https://kotlinlang.org/docs/reference/building-mpp-with-gradle.html#configuring-compilations

[avjiang]

Hi, i am still facing the issue. Please enlighten me. Below is my settings

apply plugin: 'kotlin-multiplatform'

kotlin {
  jvm {
    compilations.main.kotlinOptions {
        // Setup the Kotlin compiler options for the 'main' compilation:
        jvmTarget = "1.8"
    }

    compilations.main.compileKotlinTask // get the Kotlin task 'compileKotlinJvm'
    compilations.main.output // get the main compilation output
    compilations.test.runtimeDependencyFiles // get the test runtime classpath
  }

// Configure all compilations of all targets:
targets.all {
    compilations.all {
        kotlinOptions {
            allWarningsAsErrors = true
        }
    }
 }
}

sourceSets {
    commonMain {
        dependencies {
            implementation "com.soywiz.korlibs.klock:klock:$klockVersion" // 1.8.0
        }
    }
}

kotlin version is 1.3.60

[avjiang]

Hi @soywiz, is there any update about this issue?

I have tried to use the 1.8.0 library version with kotlin version = 1.3.60, but still encounter JVM target issue. I did not face any problem below version 1.8.0. And I have set the jvm target to 1.8 as well in the build.gradle. The target JVM version in Settings -> Kotlin Compiler also has been set to 1.8. And on top of that I have clean reinstalled the Android Studio as well.

I am facing the JVM target error when I want to run my CommonTest file. However, i can successfully exported my multiplatform project to iOS. So basically I have to use 1.7.0 version for my Kotlin Multiplatform project testing, and use the version 1.8.0 to export it as iOS framework.

This is my java -version

 Java version "11.0.2" 2019-01-15 LTS
 Java(TM) SE Runtime Environment 18.9 (build 11.0.2+9-LTS)
 Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.2+9-LTS, mixed mode)

Hopefully you can help me on this issue... Thanks

[soywiz]

You have to set the kotlinOptions.jvmTarget on your build.gradle file to "1.8".

Like here:
https://github.com/korlibs/easy-kotlin-mpp-gradle-plugin/blob/7373efde446827e965d92c6a61bf8d00637e22bc/src/main/kotlin/com/soywiz/korlibs/targets/JVM.kt#L16

[avjiang]

I have included the jvm target to my build.gradle. The sample code is on the previous message. Is it wrong?

[soywiz]

Can you generate a small project reproducing the issue in a repo or a zip file? It should work. But if it doesn't I'' investigate it

[avjiang]

Noted. I will provide u a sample application soon. Ty in advance!

[avjiang]

hi @soywiz , I Have attached a sample app. Thanks!

sample_app.zip

[soywiz]

Sorry for the huge delay. I didn't know your problem was with the android. The jvm config is for jvm desktop. You have to specify kotlinOptions.jvmTarget for android too:

Change:

jvm("android")

with

jvm("android") {
    compilations.getting {
        kotlinOptions {
            // Setup the Kotlin compiler options for the 'main' compilation:
            jvmTarget = "1.8"
        }
    }
}

[avjiang]

hi @soywiz

Since our current project is using groovy, i tried to find proper syntax to it and i come out with below settings

jvm("android") {
        compilations.main.kotlinOptions {
            jvmTarget = "1.8"
        }
    }

and seems like it doesn't throw the jvm target error anymore. I tried to get you sample app by using groovy, but the tutorial is using kotlin, not groovy anymore.

So i guess it has been fixed now. Thank you so much for your help!