jsf - Restore viewRoot from Redis -

i have been trying store current view information in redis. when server goes down , again retrieve session info redis. manually create viewroot , set facescontext viewroot new one. still goes viewexpiredexception in restoreviewphase because viewroot null still.

this restore session info:

 byte[] retrievedbytearray = redismanager.getconnection().hget((tms_ui_sessionid_ + providedsessionid + "bytearray").getbytes(), ("viewstateserializedobjectfromcontext").getbytes());                     bytearrayinputstream bais = new bytearrayinputstream(retrievedbytearray);                     objectinputstream ois = null;                     try {                         ois = new objectinputstream(bais);                         serializable viewstate = null;                         try {                             viewstate = (serializable) ois.readobject();                         }                         catch (classnotfoundexception e) {                             e.printstacktrace();                         }                          uiviewroot viewroot = new uiviewroot();                         viewroot.restorestate(facescontext.getcurrentinstance(), viewstate);                         viewroot.setrenderkitid(renderkitfactory.html_basic_render_kit);                     //      viewroot.setviewid(.getviewid()); //what viewid put here???                         facescontext.getcurrentinstance().setviewroot(viewroot);                         facescontext.getcurrentinstance().renderresponse(); 

where have tie in restored view information not go mentioned exception?

thanks