Sign any jar Groovy Script

signjar.groovy

task signJar(dependsOn: 'jar',description: 'Let`s Sign JAR.',group: 'Build'){
    onlyIf {
        project.hasProperty('keyStore')
    }
    doLast{
      println ":$project.name:${name}"
      ant.signjar(
	      jar: jar.archivePath,
	      alias: project.keyStoreAlias,
	      keystore: project.keyStore,
	      storepass: project.keyStorePass,
	      tsaurl: project.tsaUrl,
	      verbose: true,
	      internalsf: true,
	      preservelastmodified: true
      )
    }
  }