java - Instantiating object only once upon multiple calls without using static -

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all want instantiate object of list once upon multiple calls servlet. please without use of static keyword not allowed here.

list<cart> list=new arraylist<cart>();          list.add(new cart(name, cost));           httpsession s=req.getsession();         s.setattribute("list",list);         out.println("item added cart");         out.println("\n<a href=\'viewserv\'>view cart</a>");         out.println("\n<a href=\'item\'>view item</a>");

as storing session, need check weather there in session or not .

   httpsession s=req.getsession();    if(s.getattribute("list") !=null){    sessionlist =new arraylist<cart>();/create new       }else {     sessionlist = (list)s.getattribute("list");    sessionlist.add(....    }

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