code: public static ClassLoader getExtensionClassLoader() {
          final Collection<ClassLoader> childClassLoaders = new ArrayList<>();
          childClassLoaders.addAll(_allExtensionClassLoaders);
          childClassLoaders.add(ClassLoaderUtils.getParentClassLoader());
          return new CompoundClassLoader(childClassLoaders);
      }
docs: Gets the classloader that represents the currently loaded extensions'
  classes.
  
  @return