code: public void load() {
          Stopwatchs.start("Load Plugins");
  
          classLoaders.clear();
  
          final ServletContext servletContext = AbstractServletListener.getServletContext();
          final Set<String> pluginDirPaths = servletContext.getResourcePaths("/plugins");
  
          final List<AbstractPlugin> plugins = new ArrayList<>();
  
          if (null != pluginDirPaths) {
              for (final String pluginDirPath : pluginDirPaths) {
                  try {
                      LOGGER.log(Level.INFO, "Loading plugin under directory[{0}]", pluginDirPath);
  
                      final AbstractPlugin plugin = load(pluginDirPath, pluginCache);
  
                      if (plugin != null) {
                          plugins.add(plugin);
                      }
                  } catch (final Exception e) {
                      LOGGER.log(Level.WARN, "Load plugin under directory[" + pluginDirPath + "] failed", e);
                  }
              }
          }
  
          eventManager.fireEventSynchronously(new Event<>(PLUGIN_LOADED_EVENT, plugins));
  
          Stopwatchs.end();
      }
docs: Loads plugins from directory {@literal webRoot/plugins/}.