AJAX request sending null parameter to Java Spring controller

Question

I am trying to do a simple POST request but for some reason my Integer parameter is null. This is something so basic, but I don't see what I am doing wrong here.

Here is what I have tried so far:

$rootScope.addUser = function(userId) {
            $http.post('/addUser', {
                params: {
                    user_id: userId
                }
            }).then(function(result) {
                $rootScope.userId = undefined;
            });
        };

Controller

@PostMapping("/addUser")
public void addTournament(@RequestParam(required = false) final Integer userId) {
    LOG.info("addUser: {}" , userId);
}

I have also tried doing @RequestParam(name = "user_id") final Integer userId, but even that does not work either!

In the end I will removed the 'required = false' parameter, but I left it there for now just to verify that the userId is indeed null.

The input is being grabbed from the user they input a number and click a button.

Michiel · Accepted Answer · 2019-11-02 10:20:26Z

1

The @RequestParam name does not match with the name of the attribute posted: user_id vs userId. Use @RequestParam(name = "user_id") final Integer userId to match them, or use the same request attribute and @RequestParam name.

[edit]

When I read params: { ... } I expected them to be additional request parameters instead of being part of the POST body. Could you try POSTing the data using:

$http.post('/addUser', { userId: userId }

And using the following @PostMapping:

@PostMapping("/addUser")
public void addTournament(@RequestBody User user) {
    LOG.info("addUser: {}" , user.getUserId());
}

...

class User {
private String userId;

// getter and setter
}

edited Nov 2, 2019 at 10:20

answered Nov 2, 2019 at 9:51

Michiel

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2 Comments

mr nooby noob Over a year ago

Thanks for the reply, I have tried that too but still no luck for some reason. The change I made was: @RequestParam(name = "user_id") final Integer userId, but now it does not print the log, so I am assuming it is still null for some reason...

Michiel Over a year ago

I have updated my answer, I mistook the params attribute for additional request parameters instead of being part of the POST body.

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