How to include local jars into a fat jar using Gradle 6.3?

Question

On a Linux machine running Java 8 and Gradle 6.3 I need to build a fat jar made of mix of libraries, some sourced from Maven Central, others from a local libs directory located at the root of my repository, together with my build.gradle and the gradlew:

apply plugin: 'java' repositories { mavenCentral() flatDir { dirs 'libs' } } sourceCompatibility = 1.8 targetCompatibility = 1.8 task copyLibs(type: Copy) { from configurations.compile into 'libs' } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) testImplementation "junit:junit:4.12" }

After running ./gradlew clean build and cd build/libs, if I unzip myproject.jar I can see that no dependencies have been included in the jar.

My end goal is to make my project executable as java -jar myproject.jar. How can I solve this?

Javide · Accepted Answer · 2021-06-21 10:36:56Z

This is a build.gradle that generates a fat jar including local dependencies:

plugins { id 'java' } sourceCompatibility = 1.8 targetCompatibility = 1.8 group 'com.mycompany.foo' version '1.0' jar { archiveBaseName = 'myjarname' archiveVersion = '0.1.0' manifest { attributes( 'Main-Class': 'com.mycompany.foo.Main' ) } from { configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) } } } repositories { mavenCentral() } dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) testImplementation'org.junit.jupiter:junit-jupiter-api:5.7.2' testImplementation 'org.assertj:assertj-core:3.20.2' }

bhanu · Accepted Answer · 2021-06-21 08:26:20Z

After unzipping your jar file check here for all dependencies.

Your-Project --> BOOT-INF --> libs by default, if your Gradle build is successful the jar files come here.

you can run java -jar then.

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