code: public static List<String> getPropNameList(final Class<?> cls) {
          List<String> propNameList = entityDeclaredPropNameListPool.get(cls);
  
          if (propNameList == null) {
              loadPropGetSetMethodList(cls);
              propNameList = entityDeclaredPropNameListPool.get(cls);
          }
  
          return propNameList;
      }
docs: Returns an immutable entity property name List by the specified class.
  
  @param cls
  @return