docs: protected final Date getExpiration(RenderRequest renderRequest) {
          // Expiration of the JWT
          final PortletSession portletSession = renderRequest.getPortletSession();
          final Date rslt =
                  new Date(
                          portletSession.getLastAccessedTime()
                                  + ((long) portletSession.getMaxInactiveInterval() * 1000L));
          return rslt;
      }