Gradle Signing Jar File

Problem:

How to sign jar file in gradle , same like jarsigner command line tool ?

Solution:

 we can make use of AntBuilder of Gradle (which is inherited from AntBuilder <- Groovy).

Gradle supports all ant tasks in build file with ease.

You can add task extension to jar task like this.

  jar.doLast {

         new File('build/sign').mkdirs();

         ant.signjar(

         destDir: 'build/sign',

         jar: 'build/libs/*.jar',

         alias:"anyAlias",

         storetype:"jks",

         keystore:"keystore.jks",

         storepass:"keystore_password",

         preservelastmodified:"true")

  }

Now if run below command u will see singed jar file in build/sign directory, but you have to create keystore before running gradle command and copy to root project directory.

>gradle clean jar