Duplicate fields in json due to inconsistent capitalization of the first 2 letters in the field name

[ajay mundru]

In Event class POJO

@JsonProperty("aDocId")

private String aDocId = null;

  

public String getADocId() {

    return aDocId;

  }

  public void setADocId(String aDocId) {

    this.aDocId = aDocId;

  }

-------------------------------------------------------------------------------------

While doing a post request,

Event event = (Event) object;

HttpHeaders headers = new HttpHeaders();

headers.setContentType(MediaType.APPLICATION_JSON);

HttpEntity<Event> entity = new HttpEntity<>(event, headers);

String response = restTemplate.postForObject(url, entity, String.class);

--------------------------------------------------------------------------------------

response says message cannot be accepted as it has unidentified field 

As the json getting posted has duplicate fields with different case: aDocId, adocId where as I expected only aDocId as per my Event class.

I could not change anything in the POJO as it is a auto generated class based on swagger.

I am using Spring boot. Seeking for help to resolve this scenario.

[Tatu Saloranta]

The problem here is that capitalization of `aDocId` is problematic and
does not really match implicit name that getter/setter would produce.
Because of this, Jackson things there are 2 different properties (with
different casing).
This only affects the specific case of single-lower-case-letter.

There are 2 ways to resolve this:

1. Move `@JsonProperty` annotation to getter or setter -- there is no
need to annotate Field, usually, and since it is private, it should be
ignore if not annotated
2. Add duplicate of `@JsonProperty` on getter or setter -- this will
link Field and getter/setter Methods to make them be part of one
single logical propery

I hope this helps,

-+ Tatu +-

[ajay mundru]

But Event class i have is auto generated and I cannot add annotation on the getter method. Is there any other solution to make this work?

[Tatu Saloranta]

On Tue, Aug 4, 2020 at 12:11 PM ajay mundru <ajju...@gmail.com> wrote:
>
> But Event class i have is auto generated and I cannot add annotation on the getter method. Is there any other solution to make this work?

You could use mix-in annotations (see f.ex
https://www.baeldung.com/jackson-annotations)
that can be attached without modifying actual classes.

-+ Tatu +-

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[ajay mundru]

Thanks will try this.