Fields with capital letters in the beginning are not deserialised by jackson. java

Hello. We have third party schema, where some fields begin with a capital letter.
As example:

type Query {
  user(id: Int): User
}

type User {
  ESIAPassport: String
  firstName: String
}

Generated java class for User looks like:

public class User {
  private String ESIAPassport;

  private String firstName;

  public String getESIAPassport() {
    return ESIAPassport;
  }

  public void setESIAPassport(String ESIAPassport) {
    this.ESIAPassport = ESIAPassport;
  }

  public String getFirstName() {
    return firstName;
  }

  public void setFirstName(String firstName) {
    this.firstName = firstName;
  }
}

We receive response like:

{
  "data": {
    "user": {
      "firstName": "A",
      "ESIAPassport": "1234"
    }
  }
}

If we try to read user object, then field ESIAPassport will not be deserialised by jackson, because jackson analyses setter name and expects json to contain field esiapassport.

        ObjectMapper objectMapper = new ObjectMapper()
                .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
        String response = """
                {
                  "firstName": "A",
                  "ESIAPassport": "1234"
                }
                """;
        User user = objectMapper.readValue(response, User.class);
        
        assertEquals("A", user.getFirstName()); // ok
        assertEquals("1234", user.getESIAPassport()); // fails

I suppose fix would be to add @JsonProperty annotation on getter or both getter and setter - looks like it doesn't matter for jackson.

Start with the generated Java User class and the ObjectMapper example in the issue, focusing on how Jackson derives the property name from getESIAPassport and setESIAPassport. Reproduce the failing assertions with the ESIAPassport response, then verify that the generated class deserialises both fields while preserving the existing firstName behaviour.