code: private List<Class<?>> webClasses(ExternalContext externalContext)
      {
          List<Class<?>> list = new ArrayList<Class<?>>();
          webClasses(externalContext, WEB_CLASSES_PREFIX, list);
          return list;
      }
docs: <p>Return a list of the classes defined under the
  <code>/WEB-INF/classes</code> directory of this web
  application.  If there are no such classes, a zero-length list
  will be returned.</p>
  
  @param externalContext <code>ExternalContext</code> instance for
  this application
  
  @exception ClassNotFoundException if a located class cannot be loaded