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Spring MVC Model within POST Method is empty


Spring MVC Model within POST Method is empty

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Spring MVC Model within POST Method is empty
Tag : java , By : Mario Tristan
Date : November 26 2020, 03:01 PM

I hope this helps . This problem could be resolved by changing the type of the file in the model.
Previously it was a pdfclown file and now I have changed it into a MultipartFile. In my POST Method I have converted the file from MultipartFile into pdfclown File to be able to work with it like before.

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Why is an empty Model returning to post method?


Tag : chash , By : Josh
Date : March 29 2020, 07:55 AM
it should still fix some issue Form submits values from it's inputs. You don't have inputs with names equal to your model properties names, so submitted form data does not contain these values. Other value providers (query string, route data, etc) also don't have values corresponding to model properties. So, model binder cannot bind values and you have all properties of your model equal to null (which are reference type properties).
You can use @Html.HiddenFor(m => m.Name)` as suggested by @Michael to generate hidden input in your form:
<input id="Name" type="hidden" value="username_value" name="Name">

SPRING MVC: recieving object with empty attributes in a post Method using @RequestBody


Tag : java , By : user91848
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I try to send a json Object to a Rest Service. The problem is that I recieve the object with empty attributes , You need to make your handler method parameter POJO fit your JSON
{
    "query": "",
    "element": {
        "name": "domaine",
        "labelId": "Domaines ",
        "parameterType": {
            "regEx": "^.*$",
            "errID": "121",
            "selectedValue": ""
        },
        "mandatory": false,
        "visible": true,
        "defaultValue": "",
        "elementType": "BDOC_DOMAIN_LIST",
        "regExErrMsg": "Valeur invalide.",
        "requiredErrMsg": ""
    }
}
class Wrapper {
    private String query;
    private ElementDTO element;
    // getters and setters
} 
public List<ComboValueDTO> retrieveValuesForCombo(@RequestBody ElementDTO element)
public List<ComboValueDTO> retrieveValuesForCombo(@RequestBody Wrapper element)

How to map POST parameters to model object using spring MVC method


Tag : spring , By : Bjørn Lyngwa
Date : March 29 2020, 07:55 AM
I hope this helps . I've managed to fix this using @ModelAttribute instead of @RequestBody

Received Field is Empty when the Size is Big in Spring Boot Post Method


Tag : spring , By : anov
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further 2MB are default max size for Post request parameter in tomcat. Assuming that you are using tomcat, max post size limit can be turned off by setting
server.tomcat.max-http-post-size=-1

How I see the Model in a post method MVC Spring


Tag : java , By : akr
Date : March 29 2020, 07:55 AM
like below fixes the issue All the data you placed within the model, is used by the "pagoTarjeta" view. If you wish to use that data in another controller then you should use the @ModelAttribute annotation, using @ModelAttribute simply pulls the value from the session and passes it in as a parameter to another controller.
@RequestMapping(value = "/pagoTarjeta.htm")
public String handleRequest(
       HttpServletRequest request, 
       HttpServletResponse response,
       @RequestParam Map<String, String> reqPar, 
       Model model) 
throws ServletException, IOException {

     String titulo = reqPar.get("titulo");
     String descripcion = reqPar.get("descripcion");
     Integer ServiceId = Integer.parseInt(reqPar.get("servicio"));
     Servicio servicioConsulta = servicioManager.getServiciobyId(ServiceId);
     ConsultaUrgente consultaUrgente = new ConsultaUrgente();
     Cliente cliente = clienteManager.getClientes().get(0);
     consultaUrgente.setDescripcion(descripcion);
     consultaUrgente.setTitulo(titulo);

     consultaUrgente.setServicioOrigen(servicioConsulta);
     consultaUrgente.setClienteOrigen(cliente);
     consultaUrgente.setEstado(EstadoConsulta.creada);

     model.addAtribute("consultaUrgente", consultaUrgente); // Add consultaUrgentre as an attribute to the model

     return "pagoTarjeta"; // Pass the model to the view
}


@PostMapping("/pagoTarjeta.htm")
protected ModelAndView onSubmit(@ModelAttribute("consultaUrgente") ConsultaUrgente consultaUrgent, ModelAndView modelAndView) throws Exception 
{
     // Retrieve the the object here.
}
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