public Set<Module> getPluginModules() {
   Set<Module> modules = new LinkedHashSet<Module>();
   Properties properties = loadPluginProperties();
   for (String pluginModule : properties.getProperty("plugins").split(",")) {
     try {
       modules.add(moduleRegistry.getModule(pluginModule));
     } catch (UnknownModuleException e) {
       // Ignore
       LOGGER.debug("Cannot find module for plugin {}. Ignoring.", pluginModule);
     }
   }
   return modules;
 }