code: public void reloadClasses()
      {
          File triggerDirectory = FBUtilities.cassandraTriggerDir();
          if (triggerDirectory == null)
              return;
          customClassLoader = new CustomClassLoader(parent, triggerDirectory);
          cachedTriggers.clear();
      }
docs: Reload the triggers which is already loaded, Invoking this will update
  the class loader so new jars can be loaded.