@Controller
public MyController {



  @Autowired
  private MyService myService;


  someEndpoint() {
    ....
    myService.putData(key, value);
    .....
  }


}


public class MyFilter extends GenericFilterBean {


  @Autowired
  private MyService myService;


  public void doFilter(...) {

     //this is where I have a problem.
     // the reference myService.myMap seems to be pointing to a different instance
     // than the service.myMap in the controller which doesn't make any sense to me
     // the filter obviously intercepts all requests so I would expect that after that particular
     // endpoint is accessed the data will be there for subsequent requests
     myService.getData(..);

  }

  .....
}


@Service
public class MyService {


  private Map <String,String> myMap = new HashMap <String,String> ();


  public String getData(String key) {
    return myMap.get(key);
  }

  public void putData(String key, String value){
     myMap.put(key,value);
  }


}