code: private boolean lazyLogin()
      {
          boolean ret = false;
          final HttpServletRequest httpRequest = ((ServletWebRequest) RequestCycle.get().getRequest())
                          .getContainerRequest();
          final HttpSession httpSession = httpRequest.getSession(false);
          if (httpSession != null && !(httpSession instanceof HttpSessionCopy)) {
              for (final ILoginProvider loginProvider : EFapsApplication.get().getLoginProviders()) {
                  this.userName = loginProvider.login(httpSession);
                  if (this.userName != null) {
                      break;
                  }
              }
              if (this.userName != null) {
                  openContext();
                  try {
                      setAttribute(EFapsSession.LOGIN_ATTRIBUTE_NAME, this.userName);
                      this.sessionAttributes.put(UserAttributesSet.CONTEXTMAPKEY, new UserAttributesSet(
                                      this.userName));
                  } catch (final EFapsException e) {
                      EFapsSession.LOG.error("Problems with setting UserAttribues.", e);
                  }
                  RegistryManager.registerUserSession(this.userName, getId());
                  ret = true;
                  RequestCycle.get().setResponsePage(GatherInfoPage.class);
              }
          }
          return ret;
      }
docs: Lazy login is used in copmination with a Single Sign On mechanism.
  
  @return true, if successful