gradle plugin with kotlin - set boolean extension property

Question

I am trying to migrate a gradle plugin from groovy to kotlin. I have a boolean Property that I would like to initialize to false in my plugin extension:

open class MyPluginExtension(project: Project) {

    val myBooleanProperty: Property<Boolean> = project.objects.property(Boolean::class.java)

    init {
        myBooleanProperty.set(false)
    }
}

This fails with

java.lang.IllegalArgumentException: Cannot set the value of a property of type boolean using an instance of type java.lang.Boolean.

The exception is thrown in org.gradle.api.internal.provider.DefaultPropertyState#set(T)

Any thoughts on this?

Anabolite

Looks like a bug, have you searched on github.com/gradle/kotlin-dsl/issues to see if it's been already filed? – Cantatrice

Answer 1

Boolean::class.java in Kotlin refers to the primitive type. Try specifying the Object type instead:

val myBooleanProperty: Property<Boolean> = project.objects.property(Boolean::class.javaObjectType)

Crashaw

Yes that is probably the reason. I cannot verify your answer anymore because the project has gone into a different direction in the meantime. – Anabolite