code: public void loadAddOns() {
          List<String> addonToLoad = getAddOnClasses();
          for (File f : new File(StaticConfiguration.PLUGINS_HOME).listFiles()) {
              if (f.isFile() && f.getName().toUpperCase().endsWith(".JAR")) {
                  AddOnMetadata meta = AddOnMetadata.createAddOnMetadata(f);
                  if (meta != null) {
                      mAddons.add(meta);
                      LOGGER.debug("load " + meta.getMainClass());
                      if (addonToLoad.contains(meta.getMainClass())) {
                          loadAddOn(meta);
                      }
                  }
              }
          }
      }
docs: Loads and registers all add-ons references in the engine configuration file.