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In our purely Kotlin project we would like to use flexible Java 9 module system. Otherwise we have to use internal visibility modifier too often to hide internal Kotlin module functionality from other Kotlin modules.

Is it possible to use Jigsaw in Kotlin?

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    I found your question interesting and did some research. I did not find a way to create something like module-info.kt or give an option to the Kotlin Maven or Gradle plugins to have it automatically created. However it is possible to put module-info.java into src/main/kotlin. It's easier with Maven, because everything is put under target/classes. Just take sure, that the Kotlin plugin is triggered before the Maven compiler plugin (eg. put it in phase process-sources) and that you use a version of the Maven compiler that understands META-INF/versions from kotlin.stdlib (e.g. 3.11.0). Commented Jul 2, 2023 at 8:06
  • For Gradle its described here: kotlinlang.org/docs/…. --patch-module is needed, because with Gradle Kotlin classes and Java classes are placed into different directories. You can ignore the warning from kotlinlang.org/docs/… and add sth. like sourceSets { main.java.srcDirs += 'src/main/kotlin' }. If you have specified the JVM target for Kotlin, you must now do the same for Java (e.g. compileJava { sourceCompatibility = '9'; targetCompatibility = '9' }. Commented Jul 2, 2023 at 8:22
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