Aggregating Dokka HTML in root project results in 404s when clicking on root project

[adam-enko]

Aggregating Dokka HTML in root project results in 404s when clicking on root project

Reproduce

Modify https://github.com/Kotlin/dokka/tree/v2.0.0/examples/gradle-v2/multimodule-example

• Add a Kotlin class to the root project src/main/kotlin/RootClass.kt

• Aggregate in the root project:

  plugins {
      kotlin("jvm")
      `dokka-convention`
  }
  dependencies {
      dokka(rootProject)
      dokka(project(":childProjectA"))
      dokka(project(":childProjectB"))
  }

• Run ./gradlew :dokkaGen

Error

The HTML homepage looks correct (with URL http://localhost:63342/dokka/examples/gradle-v2/multimodule-example/build/dokka/html/index.html), and contains the root project (named multimodule-example)

However, clicking on multimodule-example results in a 404.

Note that the 404ing URL has a double slash // and /html/ is missing.

http://localhost:63342/dokka/examples/gradle-v2/multimodule-example/build/dokka//index.html

Expected:
http://localhost:63342/dokka/examples/gradle-v2/multimodule-example/build/dokka/html/[root]/index.html
Actual:
http://localhost:63342/dokka/examples/gradle-v2/multimodule-example/build/dokka//index.html

Workaround

To workaround specify modulePath in the root project:

dokka {
   modulePath = "root"
}

Additional context

• Slack thread https://kotlinlang.slack.com/archives/C0F4UNJET/p1735409601588549 (archive)

[whyoleg]

probably it's the same as #3979