gradle fails to compile java classes using kotlin class

Question

I have a gradle 4.1 multiproject containing a "projectA" containing 2 subfolders "api" and "implementation".

The multiproject uses kotlin and java-library plugins defined in the subprojects section of the main build.gradle. The implementation project avec a API dependency to :projectA:api

In the api folder I have kotlin and java files inside 'src/main/java' and in the implementation project I'm creating a new instance of a kotlin class from the API.

Inside Intellij Idea, I don't have any compilation errors ; but when I compile the whole project using gradle I have an error: cannot find symbol. It is as if the compileJava doesn't have access to the folder kotlin-classes.

Inside the build/kotlin-classes, I see my file.class The class file is on build/classes dir also

Details of the error :

Task :projectA:api:compileKotlin Using kotlin incremental compilation

Task :projectA:implementation:compileJava (...) error: cannot find symbol (the import fails)

Update 1 : removing java-library solved my problem

hotkey · Accepted Answer · 2017-08-18 21:37:16Z

This is a known issue of the java-library plugin: when used in a project with another JVM language (Kotlin, Scala, Groovy etc.) , it does not register the classes of the other language so that the dependent projects get them as they consume the classes.

Fortunately, it has a workaround as well. Adapted to Kotlin, it would look like:

configurations {
    apiElements {
        outgoing.variants.getByName('classes').artifact(
            file: compileKotlin.destinationDir,
            type: ArtifactTypeDefinition.JVM_CLASS_DIRECTORY,
            builtBy: compileKotlin)
    }
}

^{If you use Kapt1, it's file: compileKotlinAfterJava.destinationDir, and for Gradle versions lower than 4.0 use builtBy: copyMainKotlinClasses instead.}

This issue is also tracked in the Kotlin issue tracker: KT-18497, follow that issue to see when it's fixed on the Kotlin Gradle plugin side, so that the above workaround will be no more necessary.

Collectives™ on Stack Overflow

gradle fails to compile java classes using kotlin class

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related