build.gradle

apply plugin: 'java'
apply plugin: 'application'

version = '1.0'

repositories {
    mavenCentral()
}

sourceSets {
  main {
    java {
       srcDirs 'src/main/java'
    }
  }
}

dependencies {
    // https://mvnrepository.com/artifact/commons-io/commons-io
    compile group: 'commons-io', name: 'commons-io', version: '2.4'
    // https://mvnrepository.com/artifact/com.google.code.gson/gson
    compile group: 'com.google.code.gson', name: 'gson', version: '2.8.0'
    // https://mvnrepository.com/artifact/org.apache.commons/commons-math3
    compile group: 'org.apache.commons', name: 'commons-math3', version: '3.6.1'
}

mainClassName = "me.danielschaefer.digitrecognition.Test"

jar {
    manifest {
        attributes 'Main-Class': mainClassName
    }
}

task fatJar(type: Jar) {
     manifest {
        attributes 'Implementation-Title': 'DigitRecognition',
                   'Implementation-Version': version,
                   'Main-Class': 'me.danielschaefer.digitrecognition.Test'
    }
    baseName = project.name
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    with jar
}