Latest version of com.typesafe.akka:akka-contrib-extra_2.11
https://javadoc.io/doc/com.typesafe.akka/akka-contrib-extra_2.11
Current version 2.0.0-a1
https://javadoc.io/doc/com.typesafe.akka/akka-contrib-extra_2.11/2.0.0-a1
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.typesafe.akka/akka-contrib-extra_2.11/2.0.0-a1/package-list