Gradle buildscript for bukkit to shadow Kotlin runtime

build.gradle

group 'lt.ekgame' // change the group to what suits you
version '0.0.1-SNAPSHOT'

buildscript {
    ext.kotlin_version = '1.1.4-3'              // May need to be hhanged
    ext.bukkit_version = "1.12.1-R0.1-SNAPSHOT" // May need to be hhanged

    repositories {
        mavenCentral()
        jcenter()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.github.jengelman.gradle.plugins:shadow:2.0.1'
    }
}

apply plugin: 'java'
apply plugin: 'kotlin'

sourceCompatibility = 1.8

configurations {
    shadow
    compile.extendsFrom provided
    provided.extendsFrom shadow
}

repositories {
    mavenCentral()
    maven {
        url "https://hub.spigotmc.org/nexus/content/repositories/snapshots/"
    }
}

dependencies {
    shadow "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
    compile "org.bukkit:bukkit:$bukkit_version"
    testCompile group: 'junit', name: 'junit', version: '4.12'
}

compileKotlin {
    kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
    kotlinOptions.jvmTarget = "1.8"
}

import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar

task fatJar(type: ShadowJar) {
    configurations = [project.configurations.shadow]
    from(project.sourceSets.main.output)
}