@Override public void handleRequest(HttpServerExchange exchange) throws Exception { final String incomingSessionId = servletContext.getSessionConfig().findSessionId(exchange); if (incomingSessionId == null || !data.containsKey(incomingSessionId)) { next.handleRequest(exchange); return; } // we have some old data PersistentSession result = data.remove(incomingSessionId); if (result != null) { long time = System.currentTimeMillis(); if (time < result.getExpiration().getTime()) { final HttpSessionImpl session = servletContext.getSession(exchange, true); final HttpSessionEvent event = new HttpSessionEvent(session); for (Map.Entry<String, Object> entry : result.getSessionData().entrySet()) { if (entry.getValue() instanceof HttpSessionActivationListener) { ((HttpSessionActivationListener) entry.getValue()).sessionDidActivate(event); } if (entry.getKey().startsWith(HttpSessionImpl.IO_UNDERTOW)) { session.getSession().setAttribute(entry.getKey(), entry.getValue()); } else { session.setAttribute(entry.getKey(), entry.getValue()); } } } } next.handleRequest(exchange); }