Spring controller method don't recognize parameter passed by jquery .ajax() function

Question

In my project, I have the following .ajax() function, which should send the content of a with multiple values to the server:

$("#btn_enviar").click(function(){
    var selecao_usuario=[];
    $('#selecao option').each(function(){
        selecao_usuario.push($(this).val());
    });
    $.ajax({
        url: "lista_horario.html",
        data: { id_usuarios: selecao_usuario, id_evento: $('#id_evento option:selected').val() },
        cache: false
    }).done(function(data) {
        $("#result").show();
        $("#result").empty().append( data );
    });
});

What happens is that, according to browser console, this is the parameters this function is sending to server:

id_evento "1"
id_usuarios[] "9"
id_usuarios[] "4"
id_usuarios[] "7"
id_usuarios[] "8"

and because this last parameter, I am getting this error from server:

HTTP Status 400 - Required String[] parameter 'id_usuarios' is not present

type Status report

message Required String[] parameter 'id_usuarios' is not present

description The request sent by the client was syntactically incorrect.
Apache Tomcat/7.0.42

the function above is sending the data for this method from my spring controller:

@RequestMapping(value="/lista_horario", method=RequestMethod.GET)
@ResponseBody
public String lista_horario(@RequestParam("id_evento") String id_evento, @RequestParam("id_usuarios") String[] usuarios)
{
     ...
     }

Maciej Walkowiak · Accepted Answer · 2014-03-23 19:06:01Z

1

Param name in Spring MVC has to match param name in request. In your case change param name from @RequestParam("id_usuarios") to @RequestParam("id_usuarios[]").

answered Mar 23, 2014 at 19:06

Maciej Walkowiak

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Comments

Oscar Paz · Accepted Answer · 2014-03-23 12:31:46Z

0

The last parameter is sent because of the cache: false option in the ajax call. To prevent caching of the response, jQuery adds the parameter _ with a value that equals the current timestamp (the result of Date.now()). This way, the request is always different and is not cached by the browser. If it is causing problems, then disable the cache via server response headers and remove the cache parameter from your call to ajax(). I'm not sure, though, that this is the reason why you're getting an error. Try removing the argument and see if it works.

answered Mar 23, 2014 at 12:31

Oscar Paz

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4 Comments

Kleber Mota Over a year ago

Ok, I did this change, but the problem still happening. I udpate the question to include the method which is the target of the request.

Oscar Paz Over a year ago

But are you getting the same error? If you took out the cache property from the call, you shouldn't be sending the _ query parameter.

Kleber Mota Over a year ago

yes, i am getting the same error, but I am not sending the _ query parameter anymore.

Oscar Paz Over a year ago

Then the problem wasn't that parameter. However, I'm not an expert on Java or Spring. I suggest you to add the java and spring tags to your question, so people expert on those areas can help you.

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