Spring Rest : pass an object in RequestParam

Question

I want to pass a list of objects in my request through @RequestParam but it doesn't work.
If I do :

 public List<Affaire> getAllAffaires( @RequestParam(value = "consultantId", required = false) Long consultantId, @RequestParam(value = "filtres", required = false) List<FilterDTO> filtres)

It doesnt go into the method, I get a 500 Error.
If I do :

 public List<Affaire> getAllAffaires( @RequestParam(value = "consultantId", required = false) Long consultantId, List<FilterDTO> filtres)

I am getting a :

Unable to evaluate the expression Method threw 'java.lang.IllegalArgumentException' exception.

If I pass another object which contains the list as :

 public List<Affaire> getAllAffaires( @RequestParam(value = "consultantId", required = false) Long consultantId, FilterDTOList filtres)

I get into the method but the property listFiltre of FilterDTOList is always null.

In Front Side (AngularJS) the call is :

function Affaire ($resource, DateUtils) { var resourceUrl = 'api/affaires/:id'; return $resource(resourceUrl, {}, { 'query': { method: 'GET', isArray: true, params:{ consultantId:'@consultantId', filtres:'@filtres' },

How can I do pass my List as a parameter of my request?

User @RequestBody FilterDTOList filtres and pass filters in request body. — Sudhir Ojha
– Sudhir Ojha, Commented Oct 25, 2021 at 12:52
Could you provide more information? How are you doing the request to the service? Which HTTP verb are you using? — Nico
– Nico, Commented Oct 25, 2021 at 12:55
Can you provide stacktrace when 500 is thrown in the first example? It looks like there is no mapping defined for FilterDTO. Probably, if you inject request param to List<String> and then map from String to FilterDTO, it will work but it's hard to tell without additional context — CaptainAye
– CaptainAye, Commented Oct 25, 2021 at 13:00
there is not stacktrace , it seems that it doesnt even go into the java method. — thomas
– thomas, Commented Oct 25, 2021 at 13:07

Mani · Accepted Answer · 2021-10-26 04:31:59Z

try with array instead of List and then convert that array to List

 @PostMapping(value = "/updateAllAffaires") @ResponseBody public List<FilterDTO> getSelectedGenes(@RequestParam(value = "consultantId", required = false) Long consultantId, @RequestBody FilterDTO[] filtersDto) { List<FilterDTO> filters = new ArrayList<>(); // here you can use the logic to convert array to list return filters; }

Nirmal Kumar · Accepted Answer · 2021-10-26 15:58:14Z

Try using @ModelAttribute or @Requestbody instead of @RequestParam.

public List<Affaire> getAllAffaires( @RequestParam(value = "consultantId", required = false) Long consultantId, @ModelAttribute(value = "filtres", required = false) List<FilterDTO> filtres)

You can read this answer for better understanding. This will also help.

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