Generate Jar with dependencies (fatJar) using Gradle

There are multiple posts (old and new) with instructions on how to generate a fat jar, this is, a jar file for your application containing also your application's dependencies. Most solutions I have tried did not work for me, even in a simple Hello World java application, but I have found one that seems to work as expected.

Here it is:

Instructions

Create your Gradle java project as usual. Then:

• Adjust your build.gradle file to have the java and application plugins.
• Mark your application dependencies as implementation (see the dependencies section).
• Be sure to have a defined mainClassName.
• Define the fatJar as described below.
• When running your Gradle tasks, make sure to call the fatJar task instead of the normal jar task.

Here is an example build.gradle content with all the mentioned tips:

plugins {
    id 'java'
    id 'application'
}

group 'dev.test'
version '1.0.0'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'your.test.dependency.libs:here:1.0.1'

    testImplementation group: 'junit', name: 'junit', version: '4.12'
}

mainClassName = 'dev.test.your.App'

task fatJar(type: Jar) {
    manifest {
        attributes 'Main-Class': "${mainClassName}"
    }
    archiveBaseName = "${rootProject.name}"
    from { configurations.compileClasspath.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}

Credits

Source: Gradle: Part 4, Creating a fat jar using Gradle