CODEWITHSUNDEEP
spring-mvc
Souad
Souad

Reputation: 5094

How to check if @RequestParam is empty or not?

I have two pages, the first has a form with hidden fields which send parameters to the second one. I want to return an error message if the user go to the second page while the form with hidden fields is empty, so for doing that i tried that but it's not working: 

@RequestMapping(value="/generate",method=RequestMethod.POST)
    public String FicheService(@ModelAttribute Movement movement,@RequestParam("nom") String nom, @RequestParam("number") Integer number,ModelMap model){


   if(nom=="" && number == null) { model.addAttribute("errorMessage",true);
                               return "firstPage";
                              }
   else { return "secondPage";}


}

How to check if @RequestParam is empty or not?

Upvotes: 1

Views: 14486

Answers (1)

Biju Kunjummen
Biju Kunjummen

Reputation: 49935

You can specify the @RequestParam, with a required attribute value of false:

@RequestParam(value="nom", required=false)

and then check the null condition the way you have done.

Upvotes: 7

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