archaius-core/src/main/java/com/netflix/config/ConfigurationManager.java
public static void loadProperties(Properties properties) {
        if (instance == null) {
            instance = getConfigInstance();
        }
        ConfigurationUtils.loadProperties(properties, instance);
    }
public static void loadProperties(Properties properties) {
        if (instance == null) {
            instance = getConfigInstance();
        }
        ConfigurationUtils.loadProperties(properties, instance);
    }
Load the specified properties into system wide configuration