[JAVA] Use ProGuard with Gradle

I've never used ProGuard in Gradle, so make a note of how to do it.

Note: This article is * not * about Android. When you say ProGuard in Gradle, there are only articles for Android, but this is not the case.


buildscript {
    dependencies {


jar {
    manifest {
        attributes 'Main-Class': 'rip.deadcode.Main'  //Modify according to your Main class
    //Make Fat Jar
    from { configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } }
    exclude 'META-INF/*.RSA', 'META-INF/*.SF','META-INF/*.DSA'

task proguard(type: proguard.gradle.ProGuardTask, dependsOn: jar) {

    def javaHome = System.getProperty('java.home')

    //JAR for Shrink
    injars jar.archivePath

    libraryjars files(
            "${javaHome}/lib/rt.jar",  //Java SE runtime
            "${javaHome}/lib/jce.jar"  //crypto module

    //If you don't use Fat JAR, add dependent libraries to libraryjars
//    libraryjars configurations.compile.files

    //Output destination please as you like

    //Classes that do not shrink
    keep("public class ${jar.manifest.attributes['Main-Class']} { public static void main(java.lang.String[]); }")


//ProGuard when assembling


ProGuard on AWS Lambda

I'd like to remove unnecessary code as much as possible to improve the speed at cold start, but various settings are required.

keep("public class rip.deadcode.bot.Application { *; }")  //Method implementing RequestHandler
keep("public interface com.amazonaws.services.lambda.runtime.RequestHandler { *; }")
keep("class com.amazonaws.** { *; }")
keep("class com.fasterxml.** { *; }")

With RequestStreamHandler, it seems that many parts of this time will not be a problem, so it may be necessary to use it instead of wearing it sideways.

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