Configuring tasks via Gradle plugin using Kotlin DSL

Question

I'm trying to convert some task configuration in my Gradle plugin from Groovy to Kotlin. All of the examples I've found are about normal build scripts, and that approach doesn't seem to directly translate to plugin usage. My attempt below:

class JavaConventionsPlugin : Plugin<Project> {
    // ...
    fun configureBasicJavaOptions(project: Project) {
        project.tasks.withType<JavaCompile> {
            options.encoding = "cp1252"
            options.warning = false
        }
    }
}

produces these errors:

Type mismatch: inferred type is () -> Unit but Class<TypeVariable(S)!>! was expected
Unresolved reference: options
Variable expected

What the right way to do this?

I'm using a composite build where the gradle plugin is just an ordinary project rather than buildSrc. — Brad Mace
– Brad Mace, Commented Dec 7, 2021 at 16:47

Brad Mace · Accepted Answer · 2021-12-07 17:21:02Z

2

I'm not sure if this is the way, but it seems to work:

    private fun configureBasicJavaOptions(project: Project) {
        project.tasks.withType(JavaCompile::class.java) { t ->
            t.options.encoding = "cp1252"
            t.options.isWarnings = false
        }
    }

answered Dec 7, 2021 at 17:21

Brad Mace

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1 Comment

Cisco Over a year ago

This works and uses the Java API as I mentioned in your other question. One thing to keep in mind with this approach is that withType(Class<T> clazz) will configure ALL tasks of that type. That may or may not be what you want. You can use named(taskName, clazz) {} instead to configure a specific task.

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