docs: public void setActionClass(String value) {
  
          checkFrozen();
          if (CmsStringUtil.isEmpty(value)) {
              m_actionClass = null;
          } else {
              if (!CmsStringUtil.isValidJavaClassName(value)) {
                  throw new CmsIllegalArgumentException(
                      Messages.get().container(Messages.ERR_MODULE_ACTION_CLASS_2, value, getName()));
              }
              m_actionClass = value;
          }
      }