Dokka 2.0 migration dokkaJavadoc issue

[driessamyn]

Describe the bug
I am converting my project to Dokka 2, follwoing the documentation and running into a couple of issues.

gradle dokkaJavadoc executes succssfully but does not generate anything.

Adding

tasks.register<Jar>("dokkaJavadocJar") {
    dependsOn(tasks.dokkaJavadoc)
    from(tasks.dokkaJavadoc.flatMap { it.outputDirectory })
    archiveClassifier.set("javadoc")
}

as indicated in the docs here and running gradle dokkaJavadocJar gives the following error:

* What went wrong:
Execution failed for task ':kapper:dokkaJavadocJar'.
> Cannot query the value of this provider because it has no value available.
  The value of this provider is derived from:
    - task ':kapper:dokkaJavadoc' property 'outputDirectory'

The same error is produced for the dokkaHtmlJar example.

Expected behaviour

gradle dokkaJavadoc to generate javadocs
gradle dokkaJavadocJar to complete successfully.

To Reproduce

gradle dokkaJavadoc
gradle dokkaJavadocJar

Dokka configuration

id("org.jetbrains.dokka") version "2.0.0"
id("org.jetbrains.dokka-javadoc") version "2.0.0"

...

tasks.register<Jar>("dokkaHtmlJar") {
    dependsOn(tasks.dokkaHtml)
    from(tasks.dokkaHtml.flatMap { it.outputDirectory })
    archiveClassifier.set("html-docs")
}

tasks.register<Jar>("dokkaJavadocJar") {
    dependsOn(tasks.dokkaJavadoc)
    from(tasks.dokkaJavadoc.flatMap { it.outputDirectory })
    archiveClassifier.set("javadoc")
}

Installation

• Operating system: macOS
• Build tool: Gradle 8.12
• Dokka version: 2.0.0

[driessamyn]

FYI, full gradle file and project are here: https://github.com/driessamyn/kapper/blob/fix-dokka/lib/build.gradle.kts