public void stop() {
   ClassLoader old = getTccl();
   try {
     setTccl(servletContext.getClassLoader());
     this.started = false;
     final Map<String, SessionPersistenceManager.PersistentSession> objectData = new HashMap<>();
     for (String sessionId : sessionManager.getTransientSessions()) {
       Session session = sessionManager.getSession(sessionId);
       if (session != null) {
         final HttpSessionEvent event =
             new HttpSessionEvent(SecurityActions.forSession(session, servletContext, false));
         final Map<String, Object> sessionData = new HashMap<>();
         for (String attr : session.getAttributeNames()) {
           final Object attribute = session.getAttribute(attr);
           sessionData.put(attr, attribute);
           if (attribute instanceof HttpSessionActivationListener) {
             ((HttpSessionActivationListener) attribute).sessionWillPassivate(event);
           }
         }
         objectData.put(
             sessionId,
             new PersistentSession(
                 new Date(
                     session.getLastAccessedTime() + (session.getMaxInactiveInterval() * 1000)),
                 sessionData));
       }
     }
     sessionPersistenceManager.persistSessions(deploymentName, objectData);
     this.data.clear();
   } finally {
     setTccl(old);
   }
 }
 @Override
 public ClassLoader getClassLoader() {
   if (SecurityUtil.isPackageProtectionEnabled()) {
     return (ClassLoader) doPrivileged("getClassLoader", null);
   } else {
     return context.getClassLoader();
   }
 }
  public void start() {
    ClassLoader old = getTccl();
    try {
      setTccl(servletContext.getClassLoader());

      try {
        final Map<String, SessionPersistenceManager.PersistentSession> sessionData =
            sessionPersistenceManager.loadSessionAttributes(
                deploymentName, servletContext.getClassLoader());
        if (sessionData != null) {
          this.data.putAll(sessionData);
        }
      } catch (Exception e) {
        UndertowServletLogger.ROOT_LOGGER.failedtoLoadPersistentSessions(e);
      }
      this.started = true;
    } finally {
      setTccl(old);
    }
  }