Bug: Load tests fail at /create user

[megu-hub]

Branch Information

Branch: load_tests_pglez82

In gatling-simulations:

• YoviEn1aLoadTest is the java file for the test
• createuser_body.json should be in resources next to the other requests

Description

During load testing, the POST Create User endpoint is failing consistently with a 500 Internal Server Error. While static assets (CSS, JS, images) and the home page load correctly, no users are being successfully created.

===============================================================================
2026-04-22 12:42:03                                         134s elapsed
---- Requests ------------------------------------------------------------------
> Global                                                   (OK=1332   KO=333   )
> GET Home Page                                            (OK=333    KO=0     )
> yovi_en1a_logo.png                                       (OK=333    KO=0     )
> index-lTpzjcFO.css                                       (OK=333    KO=0     )
> index-ADMSZrq7.js                                        (OK=333    KO=0     )
> POST Create User                                         (OK=0      KO=333   )
---- Errors --------------------------------------------------------------------
> status.find.is(200), but actually found 500                       333 (100,0%)

And in the logs:

TypeError: Cannot destructure property 'username' of 'req.body' as it is undefined.
users  |     at /app/users-service.js:99:11

I have in the resources a file createuser_body.json in resources
i tried this json files:

{
  "username": "#{username}",
  "email": "#{email}",
  "password": "#{password}",
}

and this other

{
  "username": "#{username}",
  "email": "#{email}",
  "password": "#{password}",
  "avatarUrl": "default.png"
}

I generate users here:

(Supplier<Map<String, Object>>) () -> {
            String uuid = UUID.randomUUID().toString();
            Map<String, Object> user = new HashMap<>();
            user.put("username", "user_" + uuid);
            user.put("email",    "test_" + uuid + "@yovi.com");
            user.put("password", "Password123!");
            return user;
        }

and feed them to the event.

[pglez82]

The error that you are getting means that the req.body is undefined when it gets to the users api. We need to check what code in the gatling test (the java file) is really sending. This is what i would test:

1. check what you are receiving the the service and then run the gatling code (with just 1 user to test):

console.log(req.headers);
console.log(req.body);

2. try to pass something like this in gatling to see if it works:

.body(StringBody("""
{
"username": "test",
"email": "test@test.com",
"password": "1234"
}
"""))

3. Print the json that you load in gatling to make sure that is being loaded and picking the values.

Let me know if you can find out something with this tips

[pglez82]

I would like to know what was the error. Remember that this kind of information should be in the issues for traceability

[megu-hub]

Hello, I changed the version (I was using 3.10.0 instead of 3.10.5) and instead of using localhost i used the IP of the VM and it worked. The paths were exactly as you show me in class so that was not the error.