docs: private PluginRegistryBean loadRegistry(URI registryUrl) {
          PluginRegistryBean fromCache = registryCache.get(registryUrl);
          if (fromCache != null) {
              return fromCache;
          }
          try {
              PluginRegistryBean registry = mapper.reader(PluginRegistryBean.class).readValue(registryUrl.toURL());
              registryCache.put(registryUrl, registry);
              return registry;
          } catch (IOException e) {
              return null;
          }
      }