How to check if @RequestParam is empty or not?

Question

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";}


}

You can user @NotEmpty annotation for such validations

MCF
– MCF

2013-06-04 07:40:58 +00:00
Commented Jun 4, 2013 at 7:40 — MCF
– MCF, Commented Jun 4, 2013 at 7:40

Biju Kunjummen · Accepted Answer · 2013-06-03 22:08:10Z

7

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.

answered Jun 3, 2013 at 22:08

Biju Kunjummen

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