code: private static void saveClass(final ClassLoader cl, final Class c) {
          if (LOADED_PLUGINS.get(cl) == null) {
              LOADED_PLUGINS.put(cl, new ClassesData());
          }
  
          ClassesData cd = LOADED_PLUGINS.get(cl);
          cd.addClass(c);
      }
docs: Stores a class in the cache.
  
  @param cl
  The classloader
  @param c
  the class to be stored