Basic build.gradle with fat jar capability

build.gradle

plugins {
    id 'java'
    id 'application'
}

mainClassName = 'App'

dependencies {
    testCompile 'junit:junit:4.12'
}

repositories {
    jcenter()
}

jar {
    from {
        (configurations.runtime).collect {
            it.isDirectory() ? it : zipTree(it)
        }
    }
    manifest {
        attributes('Main-Class': 'App' )
    }
}