javascript - how to return error message from in controller rather than returning modelAndView in spring mvc -

i passing id in controller list page, getting processed , result set in model.addobject().

also, setting view in new modelandview("viewname"). new data shown on new jsp. adding logic if id passed list page same userid in session, need show error message "you cannot user selected yourslef" on same list page rather showing new page new data.

this method syntax.

    public modelandview showdetails(@requestparam ("userlogin") userlogin userlogin){....      return modelandview;     } 

please suggest way it.

as method returns view , map object ,

public modelandview showdetails(@requestparam ("userlogin") userlogin userlogin){....      // verify session here        if (session.getattribute("name").equals("name") {  string vale = "you cannot user selected yourslef"      return modelandview("viewname","value",value);     } 

and in jsp ,

use el print ,

${value} 

hope helps !!