pf4j/demo_gradle/plugins/plugin3/build.gradle

buildscript {
    ext.kotlin_version = '1.1.2-2'

    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

jar {
    baseName = 'KotlinPlugin'
    version = '0.1.0'
    manifest {
        attributes 'Plugin-Class' : 'ro.fortsoft.pf4j.demo.kotlin.KotlinPlugin',
                'Plugin-Id' : 'KotlinPlugin',
                'Plugin-Version' : '1.0.0',
                'Plugin-Provider' : 'Anindya Chatterjee'
    }
}

task plugin(type: Jar) {
    baseName = 'KotlinPlugin'
    version = '0.1.0'
    into('classes'){
        with jar
    }
    into('lib'){
        from configurations.compile
    }
    extension('zip')
}
assemble.dependsOn plugin

apply plugin: 'kotlin'
apply plugin: 'kotlin-kapt'

repositories {
    mavenCentral()
}

dependencies {
    compileOnly project(':api')
    kapt ('ro.fortsoft.pf4j:pf4j:1.3.0') {
        exclude group: "org.slf4j"
    }
    compile 'org.apache.commons:commons-lang3:3.5'
    testCompile group: 'junit', name: 'junit', version: '4.+'
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
}