private Registry readDefaultConfiguration() {
    // if it contains some old configuration, remove it (Archiva 0.9)
    registry.removeSubset(KEY);

    try {
      registry.addConfigurationFromResource(
          "org/apache/archiva/configuration/default-archiva.xml", KEY);
      this.isConfigurationDefaulted = true;
    } catch (RegistryException e) {
      throw new ConfigurationRuntimeException(
          "Fatal error: Unable to find the built-in default configuration and load it into the registry",
          e);
    }
    return registry.getSubset(KEY);
  }