https://developer.lightbend.com/guides/akka-quickstart-java/

Make sure that you have installed the build tool of your choice and thereafter open a Terminal window and, from inside the project directory, type the following to run Hello World:

Maven
$ mvn compile exec:exec
Gradle
The output should look something like this (scroll all the way to the right to see the Actor output):

Maven
Scanning for projects...
[INFO]
[INFO] ------------------------< hello-akka-java:app >-------------------------
[INFO] Building app 1.0
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ app ---
[WARNING] Using platform encoding (UTF-8 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO]
[INFO] --- exec-maven-plugin:1.6.0:exec (default-cli) @ app ---
[2019-10-12 09:20:30,248] [INFO] [akka.event.slf4j.Slf4jLogger] [helloakka-akka.actor.default-dispatcher-3] [] -
Slf4jLogger started
SLF4J: A number (1) of logging calls during the initialization phase have been intercepted and are
SLF4J: now being replayed. These are subject to the filtering rules of the underlying logging system.
SLF4J: See also http://www.slf4j.org/codes.html#replay

Press ENTER to exit <<<
[2019-10-12 09:20:30,288] [INFO] [com.lightbend.akka.sample.Greeter] [helloakka-akka.actor.default-dispatcher-6]
[akka://helloakka/user/greeter] - Hello Charles!
[2019-10-12 09:20:30,290] [INFO] [com.lightbend.akka.sample.HelloWorldBot] [helloakka-akka.actor.default-dispatcher-3]
[akka://helloakka/user/Charles] - Greeting 1 for Charles
[2019-10-12 09:20:30,291] [INFO] [com.lightbend.akka.sample.Greeter] [helloakka-akka.actor.default-dispatcher-6]
[akka://helloakka/user/greeter] - Hello Charles!
[2019-10-12 09:20:30,291] [INFO] [com.lightbend.akka.sample.HelloWorldBot] [helloakka-akka.actor.default-dispatcher-3]
[akka://helloakka/user/Charles] - Greeting 2 for Charles
[2019-10-12 09:20:30,291] [INFO] [com.lightbend.akka.sample.Greeter] [helloakka-akka.actor.default-dispatcher-6]
[akka://helloakka/user/greeter] - Hello Charles!
[2019-10-12 09:20:30,291] [INFO] [com.lightbend.akka.sample.HelloWorldBot] [helloakka-akka.actor.default-dispatcher-3]
[akka://helloakka/user/Charles] - Greeting 3 for Charles

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