i am working on Gitlab CI, more specifically with the API and the pipeline. I did some test on Bruno and the API was working fine but when i try with my program on Jakarta EE 10 i have an issue.
My aim is to run a pipeline throught gitlab API using specifif variables, so i create a request following this.

I set up my path https://mygitlab/api/v4/projects/:id/pipeline?ref=branch
and my variables, when I Sysout the body of my HTTP Post Request

{
  "variables": [
    {
      "key": "foo",
      "value": "bar"
    },
    {
      "key": "alice",
      "value": "bob"
    },
    {
      "key": "key",
      "value": "value"
    }
  ]
}

And when i invoke my HTTP Post request i have this error with a code 400
{“error”:”variables[0][key] is invalid, variables[1][key] is invalid, variables[2][key] is invalid, variables[3][key] is invalid, variables[0][value] is invalid, variables[1][value] is invalid, variables[2][value] is invalid, variables[3][value] is invalid”}

I tried to launch the request with the same body on a postman like and it works so i expect that my problem come from Java or my wa to launch the request
Here is my code where i launch the request

        buildJson.add("variables",arrayBuilder);
        jsonObj = buildJson.build();
        //Test 
        System.out.println(target.getUri());
        System.out.println(jsonObj.toString());
        //Test

Builder bob= target.request(MediaType.APPLICATION_JSON).header("PRIVATE-TOKEN", token);
        Response response = bob.post(Entity.json(jsonObj));