code: private void addLoader(ClassLoader loader)
    {
      for (int i = _loaders.size() - 1; i >= 0; i--) {
        WeakReference<ClassLoader> ref = _loaders.get(i);
        ClassLoader refLoader = ref.get();
  
        if (refLoader == null)
          _loaders.remove(i);
  
        if (refLoader == loader)
          return;
      }
  
      _loaders.add(new WeakReference<ClassLoader>(loader));
      EnvLoader.addClassLoaderListener(this, loader);
    }
docs: Adds a class loader to the list of dependency  loaders.