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Integrate Kotlin src-dependencies into the workflow with gradle [message #1833107]

Fri, 02 October 2020 11:32

Jan Hermes

Messages: 27
Registered: September 2020

Junior Member

Hello Xtexters,

I'm currently working on a project with which I would like to use preexisting kotlin-src-files.

Unfortunately, when I reference classes defined in kotlin files I get an error about unresolved references from the generateXtext task in gradle.

The project configuration is as follows (adapted from here: https://github.com/itemis/xtext-languageserver-example

"build.gradle" in parent-project:

plugins {
        // ...
        // added kotlin jvm plugin:
  	id "org.jetbrains.kotlin.jvm" version "1.4.10" apply false
        // ...
}

// ...
configure(subprojects.findAll { it.name.startsWith('org.example') }) {

	ext.xtextVersion = '2.23.0'
	repositories {
		mavenCentral()
		jcenter()
	}
	apply plugin: 'kotlin'

	compileKotlin {
		kotlinOptions {
			jvmTarget = "11"
		}
	}
        // ...
}
// ...

Then in the main-language subproject (org.example.mydsl) I just added "compileKotlin" as a dependency to the generateXtext task:

// ...
generateXtext.dependsOn(compileKotlin)
generateXtext.dependsOn(generateXtextLanguage)
// ...

When I run

./gradlew :org.example.mydsl:generateXtext

it fails with errors to unresolved references to kotlin-classes that are referenced in xtend-files

Do you know how I can make the generateXtext task become aware of the compiled kt-classes in the virtual folder kotlin_bin?

Regards,
Jan Hermes

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Re: Integrate Kotlin src-dependencies into the workflow with gradle [message #1833108 is a reply to message #1833107]

Fri, 02 October 2020 11:36

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

sorry, i fear nobody has tried that yet. i am also not sure if this works with circular deps you have.
is there any reason you use xtend at all if you use kotlin?

maybe you can put the kotlin outputs to the classpath for generateXtext somehow.
(feeding them to compile depns or intoduce a own sourceset + add it as dep there)

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

[Updated on: Fri, 02 October 2020 11:52]

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Re: Integrate Kotlin src-dependencies into the workflow with gradle [message #1833110 is a reply to message #1833108]

Fri, 02 October 2020 12:07

Jan Hermes

Messages: 27
Registered: September 2020

Junior Member

Ok thanks for the info..

I think both languages have there advantages and I would rather use them both. But anyway there were preexisting kotlin classes that I could have quickly translated to be integrated with my existing setup if I could use kotlin directly.
Of course I also have the possibility to translate the kotlin-files to xtend or java (preferrably xtend).

--------

Two parts where I really don't want to miss xtend is the code-generator and the extension-dsl (@Inject extension XYZ).

---------

I will try a bit more and report back if I find a solution.

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