code: private void addConfigProviderToMap(Map<String, String> propertiesMap, Configuration config) {
          ConfigurationPropertiesProvider provider = new ConfigurationPropertiesProvider(config);
          propertiesMap.putAll(provider.getProperties());
      }
docs: Add JAX-RS {@code Configuration} properties to global properties.
  @param propertiesMap the global properties map.
  @param config the JAX-RX {@code Configuration} object.