java - Does the DispatcherServlet creates new instance of controller and methods inside for each user? -

good day folks. have controller in application:

        @controller         public class loginsearchcontroller {              //list store data resulthtml method             list<cars> listcars = null;               @autowired             private educationwebserviceinterface educationwebservice;                  //this method render jsp page user , create model resulthtml                 @requestmapping(value="/search", method=requestmethod.get)                 public string search(formbackingobjectsearch fbos, model model) {                            model.addattribute("fbosattributes", fbos);                      return "search";                         }                    //   method name form form object , use fetchcarsbynameservice method               // after if found stores in listofserchobjects , after listofserchobjects stores in listform list                 @requestmapping(value="/result", method=requestmethod.get)                 public string resulthtml(@requestparam string name,                                          @modelattribute("fbosattributes") formbackingobjectsearch fbos,                                           bindingresult bindingresut, model model) throws exception {                       listcars = new arraylist<cars>();                     list<cars> listofserchobjects = null;                      listofserchobjects = educationwebservice.fetchcarsbynameservice(dateconvertation(fbos.getname()));                         model.addattribute("findattributes", listofserchobjects);                            listcars.addall(listofserchobjects);                      return "search";                 }                     //this method fetch data listform make excel document form list                 @requestmapping(value="/result.xls", method=requestmethod.get)                 public string resultxls(model model) throws exception {                          if(listcars == null || listcars.size() == 0) {                             throw new nullpointerexception("arraylist<formdate> formdatelist empty list");                         } else {                                         model.addattribute("findattributesxls", listform);                         }                                    return "xlspage";                 }         } 

what happens in controller:

user goes on search page fill name of car find(in case) , after click button find

--> request goes /result. resulthtml method invoke fetchcarsbynameservice service layer fetch data corresponding particular name listofserchobjects , render on jsp page. after when listofserchobjects have data fetchcarsbynameservice add data other list listcars .

--> next step, when data rendered on jsp page there button appears save excel, happens: when user click button(if user want too) goes /result.xls and take data from listcars save in excel file.

i'm curious if multiple users work on same jsp page form different computers in web application, how listcars behave. i'm scary store last data witch extracted database , if user1 want render in excel file have data user2 if user2 make search last. think??? give me please advice. thank you

listcars corrupted , may throw concurrentmodificationexception sporadically.

below workarounds issue.

1. make listcars local variable.

   or

2. annotate controller @scope("session")

here excellent blog describes scope of controller , pros , cons.