Quarkus extension in Gradle Multi Module Project

[peterfortuin]

I'm wondering if it would be possible to write your own custom Quarkus extension inside a Gradle Multi Module project and also use that extension in a Quarkus services that is also in that same Gradle Multi Module project?

[bulldog98]

Yes that works, but is not documented at all.

I had lots of fun figuring that out.

Folder structure

some-extension
    /runtime
    /deployment

My gradle files are in kotlin, if you use groovy you should be able to adapt them
You have to name and include the projects inside of your settings.gradle(.kts) like so

include("some-extension:deployment")
project(":some-extension:deployment").name = "some-extension-deployment"
include("some-extension:runtime")
project(":some-extension:runtime").name = "some-extension"

Then in the deployment you need a build.gradle(.kts)

val quarkusPlatformGroupId: String by project
val quarkusPlatformArtifactId: String by project
val quarkusPlatformVersion: String by project

dependencies {
    implementation("io.quarkus:quarkus-core-deployment:$quarkusPlatformVersion")
    annotationProcessor("io.quarkus:quarkus-extension-processor:${quarkusPlatformVersion}") // not sure if this is needed
    // additional dependencies here

    implementation(project(":some-extension:some-extension"))
}

In the runtime you need a build.gradle(.kts)

plugins {
    id("io.quarkus.extension")
}

quarkusExtension {
    deploymentModule.set("some-extension-deployment")
}

description = "Some description"
// you can set a with:  version = "x.x.x" (make sure to also use that in the deployment)

val quarkusPlatformGroupId: String by project
val quarkusPlatformArtifactId: String by project
val quarkusPlatformVersion: String by project

dependencies {
    implementation(enforcedPlatform("${quarkusPlatformGroupId}:${quarkusPlatformArtifactId}:${quarkusPlatformVersion}"))
    implementation("io.quarkus:quarkus-core")
    annotationProcessor("io.quarkus:quarkus-extension-processor:${quarkusPlatformVersion}")
}

And in the root build file you configure the plugin version like so (inside the settings.gradle(.kts)

pluginManagement {
    val quarkusPluginVersion: String by settings
    val quarkusPluginId: String by settings
    repositories {
        mavenCentral()
        gradlePluginPortal()
        mavenLocal()
    }
    plugins {
        id(quarkusPluginId) version quarkusPluginVersion
        id("io.quarkus.extension") version quarkusPluginVersion
    }
}

[peterfortuin]

Thanks a lot. I'm going to try this.