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How to create a runnable JAR file with Gradle Java, Gradle

This post will show you how we can compile and package a simple Java Project using Gradle.

Project Layout The default project layout of a Java project with Gradle is following (just like Maven):

The src/main/java directory contains the source code. The src/main/resources directory contains the resources (such as properties files). The src/test/java directory contains the test classes. The src/test/resources directory contains the test resources.

so know make a new folder where you would like the project to start..

mkdir runnablejar cd runnablejar

Now lets create the project layout by using the following commands mkdir -p src/main/java mkdir -p src/main/resources mkdir -p src/test/java mkdir -p src/test/resources

As you can see from above the project layout looks just like a Maven project.

Creating the Main Class Lets create the main class for this project and lets have it display "Hello World"

Now cd into src/main/java

and create the package layout

mkdir -p com/johnathanmarksmith/gradle

Now we have the project layout created and also the package layout so now lets create the Main Class

vi com/johnathanmarksmith/gradle/HelloWorld.java

and insert the following lines package com.johnathanmarksmith.gradle; public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World!"); } }

Creating the Gradle Build File.. Now its time to create the Gralde Build file, Go back to the root of the project. cd ../../..

Now lets create the build file vi build.gradle

and add the following lines

apply plugin: 'java' jar { baseName = 'smith' version = '1.0' manifest { attributes 'Main-Class': 'com.johnathanmarksmith.gradle.HelloWorld' } }

Building the project and creating the JAR

To build the project and to create the JAR you need to run the following command gradle build

Executeing the JAR java -jar ./build/libs/smith-1.0.jar