[BUG] JPA/EclipseLink doesn't serialize JSON correctly

[Runi-VN]

Describe the bug
JPA/EclipseLink serializer ikke JSON i korrekt rækkefølge. (som det står I DTO'en)
To Reproduce

1. Go to 'https://maltemagnussen.com/CA2/openapi/#/General/getAllPersons'
2. Swap server to deployment
3. Click on 'Try it out'
4. Click on 'Execute'
5. See erroneous JSON output

Expected behavior
JSON should be serialized/deserialized as they are written in their respective DTO.

As it should be:

{
  "ID": 1,
  "First Name": "Johnny",
  "Last Name": "Reimar",
  "Email": "[email protected]",
  "hobbies": "Test",
  "phones": "Test",
  "Address": "Test"
}  

As it is:

{
    "email": "[email protected]",
    "firstName": "Johnny",
    "hobbies": [],
    "id": 1,
    "lastName": "Reimar",
    "phones": []
  }  

Screenshots

Additional context
We have had this issue before and I remember having it fixed. Was it by using @ElementCollection?

[Runi-VN]

ALSO

Our empty JSON lists are serialized, it would be much prettier if they weren't! Lets look into this, too.

[MalteMagnussen]

Svar fra Lars angående dette fra Slack: