How do I select a Java file？

**Question**
when I  select a kotlin file ,like this:
     sourceRoots.setFrom(file("./xxx/xxx.kt"))
it works well.
But when i select a java file :
    sourceRoots.setFrom(file("./xxx/xxxx.java"))
it not woking .

Task:dokkaHtml

**Installation**
- Operating system: macOS 12.4
- Build tool: Gradle v7.3.3
- Dokka version: 1.7.10
- IDE:Android Studio Chipmunk | 2021.2.1 Patch 1
