code: public static Class<?> getPluginClass(final String pluginClass, final File pluginDir,
        final List<String> extLibClassPaths, ClassLoader parentClassLoader) {
  
      URLClassLoader urlClassLoader =
          getURLClassLoader(pluginDir, extLibClassPaths, parentClassLoader);
  
      return getPluginClass(pluginClass, urlClassLoader);
    }
docs: Get Plugin Class
  
  @param pluginClass plugin class name
  @param pluginDir plugin root directory
  @param extLibClassPaths external Library Class Paths
  @param parentClassLoader parent class loader
  @return Plugin class or Null