How to create single jar with FatJar (Gradle)

java gradle jar

11,472

Solution 1

Well, I found solution:

task createJar(type: Jar) {
    from {
        List<File> allFiles = new ArrayList<>();
        configurations.compile.collect {
            for (File f : zipTree(it).getFiles()) {
                if (f.getName().equals("classes.jar")) {
                    allFiles.addAll(zipTree(f).getAt("asFileTrees").get(0).getDir())
                }
            }
        }
        allFiles.add(new File('build/intermediates/classes/release'))
        allFiles // To return the result inside a lambda
    }
    archiveName('MySDK.jar')
}

This code generate a single jar with all classes.

Solution 2

Very simple solution is to use the shadow plugin.
Using the plugin is very straightforward:

Declare the plugin as the first statement in your build.grade:

plugins {
id "com.github.johnrengelman.shadow" version "1.2.3"
}

Apply either java or groovy plugin.

apply plugin: 'java'

apply plugin: 'groovy'

Refresh the project and run the newly 'shadowJar' task.

This plugin also enable you to exclude dependencies, redirect (rename) packages' names and much more.

11,472

Author by

Patrick

I’m an iOS/Android software engineer who thrives on creating apps with optimal user experiences. With a background in human-computer interaction, I specialize in a esthetically pleasing interfaces that are intuitive, seamless, and functional.

Updated on June 05, 2022

Comments

Patrick almost 2 years

I want to generate a single Jar with multiple modules and dependencies. I installed FatJar Plugin but I got the below error:

My Code:

Trying shadowJar

Error:(61, 0) Could not find method shadowJar() for arguments [build_eqgfg4x39smehqcteaccdy4k6$_run_closure4@780b32c6] on project ':SDKFramework' of type org.gradle.api.Project. Open File

My build.gradle (module)

apply plugin: 'com.github.johnrengelman.shadow'
apply plugin: 'com.android.library'
apply plugin: 'groovyx.grooid.groovy-android'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 19
        versionCode 1
        versionName "0.1.1"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    lintOptions {
        abortOnError false
    }
}

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0'
        classpath 'org.codehaus.groovy:gradle-groovy-android-plugin:0.3.10'
        classpath 'com.github.jengelman.gradle.plugins:shadow:1.2.3'
    }
}

dependencies {
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile project(':framework2')
    compile 'com.google.code.gson:gson:2.6.1'
    compile 'junit:junit:4.12'
}

shadowJar {

}

Patrick almost 8 years

I tried. The 'java' plugin has been applied, but is not compatible with de android plugins
Ivan almost 8 years

just add clear android plugin: apply plugin: 'com.android.library'
Patrick almost 8 years

apply plugin: 'android' is deprecated and you cannot combine apply plugin: 'com.android.library' with apply plugin: 'java'
Ivan almost 8 years

Of cause, use just apply plugin: 'com.android.library'. Okay, look at stackoverflow.com/questions/19307341/…
Patrick almost 8 years

If I use: shadowJar { mergeServiceFiles() } Give me next error: the proyect may be using a version of the Android Gradle Plug-in that does not contain the method (e.g. 'testCompile' was added in 1.1.0)
yonisha almost 8 years

what is mergeServiceFiles function?
Patrick almost 8 years

It´s a shadow function for test. Gradle don´t recognize shadowJar methods but plugin was installed correctly
yonisha almost 8 years

Do you have java plugin or groovy plugin enabled? it is required. updated my answer
Patrick almost 8 years

Updated my question too