docs: private void addClientId(String clientId) {
          //Sometimes the client Id will be null. For instance in the case QueueConnectionFactory, there is no default client Id specified in metatype.xml.
          if (clientId == null)
              return; //do nothing
  
          ConcurrentHashMap<String, Integer> clientIdTable = JmsFactoryFactoryImpl.getClientIdTable();
  
          if (clientIdTable.containsKey(clientId)) {
              clientIdTable.put(clientId, clientIdTable.get(clientId).intValue() + 1);
          } else {
              clientIdTable.put(clientId, 1);
          }
  
      }