public ExtendingThemeManager(
     KeycloakSession session,
     ConcurrentHashMap<ExtendingThemeManagerFactory.ThemeKey, Theme> themeCache) {
   this.session = session;
   this.themeCache = themeCache;
   this.defaultTheme = Config.scope("theme").get("default", Version.NAME.toLowerCase());
 }
 @Override
 public void init(Config.Scope config) {
   if (Config.scope("theme").getBoolean("cacheThemes", true)) {
     themeCache = new ConcurrentHashMap<>();
   }
 }