How to create fat jar with gradle

Posted by On 11月 25, 2016 0 Comment

What is fat jar

When we create jar file, jar file includes only we tried to compile on our project.
Fat jar includes all dependencies of this project.

Use library

fatjar-plugin supports fat jar creation. 🙂
Add description to build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.4.0.RELEASE")
        classpath("eu.appsatori:gradle-fatjar-plugin:0.3")
    }
}

apply plugin: "java"
apply plugin: "spring-boot"
apply plugin: "idea"
apply plugin: "eu.appsatori.fatjar"

idea {
    module {
        inheritOutputDirs = false
        outputDir = file("$buildDir/classes/main/")
    }
}

repositories {
    mavenCentral()
}

fatJar {
    baseName = 'SpringBatchSample2Fat'
    manifest {
        attributes 'Main-Class' : 'yourownmainclass'
    }
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter-batch')
    compile('mysql:mysql-connector-java:5.1.40')
    testCompile("org.springframework.boot:spring-boot-starter-test")
}

The important parts are

dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:1.4.0.RELEASE")
        classpath("eu.appsatori:gradle-fatjar-plugin:0.3")
}

Add dependency of fat jar library

fatJar {
    baseName = 'SpringBatchSampleFat'
    manifest {
        attributes 'Main-Class' : 'yourownmainclass'
    }
}

This is fat jar task for gradle
baseName is jar file name.
manifest is same as jar file.

This fat jar includes all classes you need(including Spring boot dependencies in this case).

Create fat jar

On your project root

gradle fatJar

Make jar file under build/libs

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