Gradle - How to Generate an Runnable JAR File

build.gradle

apply plugin: 'java'

compileJava {
    sourceCompatibility = JavaVersion.VERSION_1_8
    targetCompatibility = JavaVersion.VERSION_1_8
    options.encoding = 'UTF-8'
}

repositories {
    mavenCentral()
}

dependencies {
...
...
...skip
}

configurations {
    implementation {
        canBeResolved = true
    }
}

task JarTestExample(type: Jar) {
    zip64 = true
    duplicatesStrategy = DuplicatesStrategy.INCLUDE
    archivesBaseName = 'TestExample'
    includeEmptyDirs = false

    manifest {
        attributes 'Main-Class': 'com.johnny.TestExample'
    }

	// remove the security files (from mail.jar / activation.jar) so that the jar will be executable.
    from (configurations.implementation.collect { it.isDirectory() ? it : zipTree(it) }) {
	    exclude 'META-INF/MANIFEST.MF'
		exclude 'META-INF/*.SF'
		exclude 'META-INF/*.DSA'
		exclude 'META-INF/*.RSA'
	}

    from sourceSets.main.output
}

johnny$ gradle clean JarTestExample