code: private static FacesInitializer _getFacesInitializerFromInitParam(ServletContext context)
      {
          String initializerClassName = context.getInitParameter(FACES_INITIALIZER_PARAM);
          if (initializerClassName != null)
          {
              try
              {
                  // get Class object
                  Class<?> clazz = ClassUtils.classForName(initializerClassName);
                  if (!FacesInitializer.class.isAssignableFrom(clazz))
                  {
                      throw new FacesException("Class " + clazz 
                              + " does not implement FacesInitializer");
                  }
                  
                  // create instance and return it
                  return (FacesInitializer) ClassUtils.newInstance(clazz);
              }
              catch (ClassNotFoundException cnfe)
              {
                  throw new FacesException("Could not find class of specified FacesInitializer", cnfe);
              }
          }
          return null;
      }
docs: Gets a FacesInitializer from the web.xml config param.
  @param context
  @return