MinecraftプラグインをKotlinで書きたい

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import java.net.URI
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    // Apply the org.jetbrains.kotlin.jvm Plugin to add support for Kotlin.
    kotlin("jvm") version "1.6.10"

    // Apply the application plugin to add support for building a CLI application in Java.
    application
}

repositories {
    // Use Maven Central for resolving dependencies.
    mavenCentral()
    maven {
        url = URI("https://hub.spigotmc.org/nexus/content/repositories/snapshots/")
    }
}

group = "グループ名"
version = "1.0-SNAPSHOT"
java.sourceCompatibility=JavaVersion.VERSION_17
val mcVersion = "1.18.1"


dependencies {
    // Align versions of all Kotlin components
    implementation(platform("org.jetbrains.kotlin:kotlin-bom"))

    // Kotlin
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")

    // Spigot API
    compileOnly("org.spigotmc:spigot-api:${mcVersion}-R0.1-SNAPSHOT")
}

application {
    // Define the main class for the application.
    mainClass.set("メインクラスを指定")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "17"
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

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import org.bukkit.plugin.java.JavaPlugin

class Main: JavaPlugin() {
    override fun onEnable() {
        println("It works!")
    }
}