public static synchronized void sessionCreated(HttpSessionEvent ev) { HttpSession httpSession = ev.getSession(); String id = httpSession.getId(); // Remember HTTP-session: { lookupHttpSessionById.put(id, httpSession); } AbstractSession session = null; synchronized (lookupSessionById) { session = lookupSessionById.get(id); } if (session == null) { Principal userPrincipal = null; Date timeCreation = new Date(httpSession.getCreationTime()); Date timeLastAccess = new Date(httpSession.getLastAccessedTime()); List<String> urisForLastRequests = null; Properties properties = null; session = new DefaultSession( id, userPrincipal, timeCreation, timeLastAccess, urisForLastRequests, properties); synchronized (lookupSessionById) { lookupSessionById.put(id, session); // Update 'sessionCountMax': { int sessionCount = lookupSessionById.size(); if (sessionCount > sessionCountMax) { sessionCountMax = sessionCount; sessionCountMaxTime = System.currentTimeMillis(); } } } } }