Do Kotlin 1.2.10 and Java 9 have opposite rules regarding automatic modules?

Question

I have a Gradle project using the Kotlin Gradle plugin. I want to build a Java 9 module, so my directory structure looks like this:

src/main/java/
    - modu         


        

Answer 1

I find it easiest to simply suppress the warnings for use of an automatic module. (In my case I have to use some automatic modules whether I want to or not, so these warnings are just distracting noise.) I have the following in my build.gradle.kts:

val compilerArgs = listOf(
    "-Xlint:all",                           // Enable all warnings except...
    "-Xlint:-requires-automatic",           // Suppress "requires directive for an automatic module" warnings from module-info.java
    "-Xlint:-requires-transitive-automatic" // Suppress "requires transitive directive for an automatic module" warnings from module-info.java
)

// This task will compile all Java code in the target module except for test code.
tasks.compileJava {
    doFirst {
        options.compilerArgs.addAll(compilerArgs)
    }
}

// This task will compile all Java test code in the target module.
tasks.compileTestJava {
    doFirst {
        options.compilerArgs.addAll(compilerArgs)
    }
}