build.gradle

plugins {
  id 'java'
}

repositories {
  mavenCentral()
}

configurations {
  yguard
}

dependencies {
  yguard 'com.yworks:yguard:4.1.1'
}

task obfuscate   {
  dependsOn jar
  group 'yGuard'
  description 'Obfuscates the java archive.'

  doLast {
    def archivePath = jar.archiveFile.get().asFile.path
    def unobfJar = archivePath.replace(".jar", "_unobf.jar")

    ant.move(file: archivePath, tofile: unobfJar, verbose: true)

    ant.taskdef(
      name: 'yguard',
      classname: 'com.yworks.yguard.YGuardTask',
      classpath: configurations.yguard.asPath
    )
    ant.yguard {
      inoutpair(in: unobfJar, out: archivePath)

      // Prevent yGuard from removing "Deprecated" attributes from .class files.
      attribute(name: "Deprecated")

      rename(logfile: "${buildDir}/${rootProject.name}_renamelog.xml") {
        keep {
          'class'(classes: 'protected', methods: 'protected', fields: 'protected')
        }
      }
    }
  }
}

assemble.dependsOn obfuscate