docs: private void updateValidation() {
  
          boolean changed = false;
          changed |= CmsVaadinUtils.updateComponentError(m_textField, null);
          String path = getValue();
          if (!CmsStringUtil.isEmptyOrWhitespaceOnly(path)) {
              if (!m_cms.existsResource(path, CmsResourceFilter.IGNORE_EXPIRATION)) {
                  ErrorMessage error = new UserError(
                      CmsVaadinUtils.getMessageText(Messages.GUI_MODULES_MODULE_RESOURCE_NOT_FOUND_0),
                      ContentMode.TEXT,
                      ErrorLevel.WARNING);
                  changed |= CmsVaadinUtils.updateComponentError(m_textField, error);
              }
          }
          if (changed) {
              fireEvent(new Component.ErrorEvent(null, this));
          }
      }