code: protected void checkFrozen() throws CmsIllegalArgumentException {
  
          if (m_frozen) {
              throw new CmsIllegalArgumentException(Messages.get().container(Messages.ERR_MODULE_FROZEN_1, getName()));
          }
      }
docs: Checks if this modules configuration is frozen.<p>
  
  @throws CmsIllegalArgumentException in case the configuration is already frozen