How to use

getSessionIfExists

method

in

org.jboss.weld.servlet.SessionHolder

/**
 * Get the session, create equals false;
 * @return http session or null if no such session exists
 */
protected HttpSession getSessionIfExists() {
  return SessionHolder.getSessionIfExists();
}

@Override
protected void setSessionAttribute(HttpServletRequest request, String name, Object value, boolean create) {
  if (create || SessionHolder.getSessionIfExists() != null) {
    getSessionFromRequest(request, true).setAttribute(name, value);
  }
}

@Override
protected Object getSessionAttribute(HttpServletRequest request, String name, boolean create) {
  if (create || SessionHolder.getSessionIfExists() != null) {
    return getSessionFromRequest(request, true).getAttribute(name);
  } else {
    return null;
  }
}

private HttpSession obtainHttpSession() {
  HttpSession session = SessionHolder.getSessionIfExists();
  if (session == null) {
    throw ServletLogger.LOG.cannotInjectObjectOutsideOfServletRequest(HttpSession.class.getSimpleName(), null);
  }
  return session;
}