pekko-sample-cluster-java: Simple Cluster Example does not work

[gamgiov]

The Simple Cluster Example does not work.
Looking in depth at the ...../simple/App.java class file and its methods I noticed a wrong config property in the private static void startup(int port) (see line 38)
The line is

overrides.put("org.apache.pekko.remote.artery.canonical.port", port);

and should be changed to

overrides.put("pekko.remote.artery.canonical.port", port);

Reading the Artery Remoting documentation (https://pekko.apache.org/docs/pekko/current/remoting-artery.html) the right config property is "pekko.remote.artery.canonical.port"

After this change the Simple Cluster Example works very well !!!

[pjfanning]

Thanks @gamgiov for providing the description. I have created #74

[pjfanning]

PR merged