code: public PluginWrapper whichPlugin(Class c) {
          PluginWrapper oneAndOnly = null;
          ClassLoader cl = c.getClassLoader();
          for (PluginWrapper p : activePlugins) {
              if (p.classLoader==cl) {
                  if (oneAndOnly!=null)
                      return null;    // ambiguous
                  oneAndOnly = p;
              }
          }
          return oneAndOnly;
      }
docs: Return the {@link PluginWrapper} that loaded the given class 'c'.
  
  @since 1.402.