public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
   OrmEntity entity = new OrmEntity();
   entity.setClassName(reader.getAttribute("class"));
   return entity;
 }
 public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
   OrmEntity entity = (OrmEntity) value;
   writer.addAttribute("class", entity.getClassName());
 }