I am currently working throug the example in the Getting Started README: <https://github.com/JetBrai...

# compose-desktop

[Draget]

I am currently working throug the example in the Getting Started README: https://github.com/JetBrains/compose-jb/blob/master/tutorials/Getting_Started/README.md and already got stuck.

I get 'Class 'androidx.compose.ui.unit.IntSize' is compiled by a new Kotlin compiler backend and cannot be loaded by the old compiler' on several keywords.
Any idea what I could be missing?

[Big Chungus]

What kotlin version are you using?

[Big Chungus]

Looks like you need 1.4.x

[altavir]

1.4.x and ir flag

[Draget]

Currently

kotlin("jvm") version "1.4.10"

as this was what the IDEA wizard suggested to me, tho I also tried 1.4.0 as in the example.

[Big Chungus]

There's an ir flag for jvm? :O

[altavir]

Either in Gradle properties or in kotlin-jvm language settings

[Draget]

Well, that is what IDEA generated for me from the 'new project Wizard'.

[Big Chungus]

What's the gradle prop?

[altavir]

Don't remember right now, but compose won't work without it

[Draget]

gradle.properties:

kotlin.code.style=official

settings.gradle.kts:

rootProject.name = "JetpackSnow"

pluginManagement {
    repositories {
        gradlePluginPortal()
        maven("<https://maven.pkg.jetbrains.space/public/p/compose/dev>")
    }
}

[Draget]

Okay… so simply running ./gradlew tasks with the example files, results in

* What went wrong:
Execution failed for task ':tasks'.
> Could not create task ':run'.
   > 'org.gradle.api.provider.Property org.gradle.api.tasks.JavaExec.getMainClass()'

sigh

[Big Chungus]

What's your jdk version?

[Big Chungus]

Compose requires 11+

[Draget]

AdoptJDK 15

[Big Chungus]

Odd. Could you try coretto jdk 11?

[Big Chungus]

Although it should work with your jdk

[Draget]

Switching quickly to 11-coretto. 🙂

[Big Chungus]

But most likely you need that jvm ir backend flag

[Big Chungus]

https://kotlinlang.org/docs/reference/whatsnew14.html#new-jvm-ir-backend

[Draget]

Right now I have it exactly as in the Getting Started guide.

[Big Chungus]

Yeah, reading the docs that looks incorrect

[Draget]

Reading the kotlin docs you linked, I added '

kotlinOptions.useIR = true

to my build.gradle.kts. The document implies, that this is auto-enabled when using the plugin.

Never the less, my IDEA also claims that kotlinOptions is an unresolved reference. I am struggling to grasp how those things play together in gradle.

[olonho]

see suggestions in https://github.com/JetBrains/compose-jb/issues/61

[Big Chungus]

You need to add this to kotlinOptions in the sourceSet or run task

[Draget]

Just wondering: Is this common knowledge and rather obvious that it needs to be added there and does not need to be mentioned on that documentation?

And if so… how can I learn this? I have been using Gradle for a while now and some things are just really opaque to me. =/

[Big Chungus]

Not a common knowledge for sure. Stuff like this is scattered all over the docs and release notes

[Big Chungus]

Although I'd start here

[Draget]

Thank you, the help is very much appreciated. I will work through the docs and maybe some time later reach that point again where my example-compose-project is still failing… but might be able to ask smarter questions there. xD

[Big Chungus]

Sure, haply to help and good luck!

[Animesh Sahu]

Exact same thing happening to me using AdoptOpenJDK 11.0.8, Kotlin 1.4.10, JB-Compose build62. https://stackoverflow.com/questions/64717218/how-to-sync-build-gradle-kts-settings-with-intellij-linter

[Animesh Sahu]

If you set the following config in the build.gradle.kts:

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

        freeCompilerArgs += listOf("-Xuse-ir")
    }
}

Project builds and runs fine, but the intellij linter is somehow unable to detect them (from gradle) and shows red lines below. As a temporary fix you can pass -Xuse-ir in ProjectStructure -> Facets manually.