code: public static synchronized void addDefaultResource(String name) {
  		if(!defaultResources.contains(name)) {
  			defaultResources.add(name);
  			for(Configuration conf : REGISTRY.keySet()) {
  				if(conf.loadDefaults) {
  					conf.reloadConfiguration();
  				}
  			}
  		}
  	}
docs: Add a default resource. Resources are loaded in the order of the resources
  added.
  @param name file name. File should be present in the classpath.