对ActionMapperFactory的一点疑惑

对ActionMapperFactory的一点疑惑

public   class  ActionMapperFactory  {
    
     protected   static   final  Log LOG  =  LogFactory.getLog(ActionMapperFactory. class );

     private   static   final  HashMap classMap  =   new  HashMap();

     public   static  ActionMapper getMapper()  {
         synchronized  (classMap)  {
            String clazz  =  (String) Configuration.get(WebWorkConstants.WEBWORK_MAPPER_CLASS);
             try   {
                ActionMapper mapper  =  (ActionMapper) classMap.get(clazz);
                 if  (mapper  ==   null )  {
                    mapper  =  (ActionMapper) ObjectFactory.getObjectFactory().buildBean(clazz,  null );
                    classMap.put(clazz, mapper);
                }

                 return  mapper;
            }   catch  (Exception e)  {
                String msg  =   " Could not create ActionMapper: WebWork will *not* work! " ;
                LOG.fatal(msg, e);
                 throw   new  RuntimeException(msg, e);
            }
        }
    }
}

明白的告诉我一下,谢谢. 觉的有点问题...