code: private static Properties load() {
  		Properties properties = new Properties();
  
  		String file = System.getProperty(CONFIGURATION_PROPERTY);
  		try {
  			if (file != null) {
  				InputStream stream;
  				if (URL_DETECTION_PATTERN.matcher(file).matches()) {
  					stream = new URL(file).openStream();
  				} else {
  					stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(file);
  					if (stream == null) {
  						stream = new FileInputStream(file);
  					}
  				}
  				load(properties, stream);
  			} else {
  				InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(DEFAULT_CONFIGURATION_FILE);
  				if (stream != null) {
  					load(properties, stream);
  				}
  			}
  		} catch (IOException ex) {
  			InternalLogger.log(Level.ERROR, "Failed loading configuration from '" + file + "'");
  		}
  
  		for (Object key : new ArrayList<Object>(System.getProperties().keySet())) {
  			String name = (String) key;
  			if (name.startsWith(PROPERTIES_PREFIX)) {
  				properties.put(name.substring(PROPERTIES_PREFIX.length()), System.getProperty(name));
  			}
  		}
  
  		for (Entry<Object, Object> entry : properties.entrySet()) {
  			String value = (String) entry.getValue();
  			if (value.indexOf('{') != -1) {
  				value = resolve(value, EnvironmentVariableResolver.INSTANCE);
  				value = resolve(value, SystemPropertyResolver.INSTANCE);
  				properties.put(entry.getKey(), value);
  			}
  		}
  
  		return properties;
  	}
docs: Loads all configuration properties.
  
  @return Found properties