akka java programmatic override configuration

The few topics I can find about this are for Scala, rather than Java, and none address remote actors.

I have a base configuration file (SERVER_CONFIG_FILE):

Include "akka-common"

TheSystem {
  akka {
    actor {
      provider = "akka.remote.RemoteActorRefProvider"
        deployment { 
          /OtherSupervisor {
            remote = "akka://OtherSystem@127.0.0.1:8553"
          }
        }
      }
    remote {
      transport = "akka.remote.netty.NettyRemoteTransport"
      netty {
        hostname = "127.0.0.1"
        port = 8552
      }
    }
  }
}

I want to load it in my program, and then override several settings, but I can't figure out the code. Something like:

private final Config serverConfig = ConfigFactory.load(SERVER_CONFIG_FILE).withValue...?

I need to override the value of "akka://DroneSystem@127.0.0.1:8553", and also the hostname. I think the hostname can be addressed by "ComparisonSystem.akka.remote.netty.hostname", but confirmation would help.

I really do not know how to address the first value, nor what java calls to use to make it come together. I can learn from an example I can see, but not from the Scala I find, and nothing addresses having that Actor Name in the path.

Thanks in advance.

You can do that like this, note that you use the Config instance with overrides and let it fallback to your default configuration rather than the other way around:

Config overrides = ConfigFactory.parseString("some.setting=a-value");
Config actualConfig = overrides.withFallback(ConfigFactory.load());

Or if you do not like building strings you could use properties to specify your overrides:

Properties properties = new Properties();
properties.setProperty("some.setting", "a-value");
Config overrides = ConfigFactory.parseProperties(properties);
Config actualConfig = overrides.withFallback(ConfigFactory.load());