code: public void fireEventListeners(EntityMetadata metadata, Object entity, Class<?> event)
      {
  
          // handle external listeners first
          List<? extends CallbackMethod> callBackMethods = metadata.getCallbackMethods(event);
  
          if (null != callBackMethods && !callBackMethods.isEmpty() && null != entity)
          {
              log.debug("Callback >> " + event.getSimpleName() + " on " + metadata.getEntityClazz().getName());
              for (CallbackMethod callback : callBackMethods)
              {
                  log.debug("Firing >> " + callback);
  
                  callback.invoke(entity);
  
              }
          }
      }
docs: Fire event listeners.
  
  @param metadata
  the metadata
  @param entity
  the entity
  @param event
  the event
  @throws PersistenceException
  the persistence exception