Sample usage of https://github.com/typesafehub/config

defaults.conf

server {
  name = "Master"
  ip = "192.168.0.10"
  files = [
    "/var/run/db/1",
    "/var/run/db/2",
    "/var/run/db/3",
  ]
}

Main.java

import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;

public class Main {

  public static void main(String[] args) {
    Config defaults = ConfigFactory.load("defaults");
    Config myconfig = ConfigFactory.load("myconfig").withFallback(defaults);
    Config other = ConfigFactory.load("other").withFallback(myconfig);

    System.out.println(
        myconfig.getString("server.name"));
    System.out.println(
        myconfig.getString("server.ip"));
    System.out.println(
        myconfig.getStringList("server.files"));
    System.out.println(
        myconfig.getString("server.grappa"));

    System.out.println(
        other.getString("foo.bar.baz"));
    System.out.println(
        other.getString("server.name"));
  }
}

myconfig.conf

server {
  ip = "192.168.0.30"
  grappa = "Grappa is great!"
}

other.json

{
  "foo": {
    "bar": {
      "baz": "Foo / Bar / Baz"
    }
  }
}