Remove null attributes from request body Spring Boot-CodePudding

I'm new to spring boot and was referring to this article. It asks to add @JsonInclude(Include.NON_NULL) annotation to remove null attributes from response body, however I'm interested in removing null attributes from request body. Please suggest how can I achieve that.

The request body is:

{
    "userUuid": "2u9k2ld8f-ghj47dhj",
    "suggestion": null
}

and the request DTO class is:

@Data
@NoArgsConstructor
public class UserRequestDTO implements Serializable {
    private String userUuid;
    @JsonInclude(JsonInclude.Include.NON_NULL)
    private String suggestion;
}

Clearly it is not working for me. When I stringify and print the request body, it includes suggestion attr which is null. Thank you for any help.

CodePudding user response：

Well... Do not use toString() use Jackson ObjectMapper. So like:

var objectMapper = new ObjectMapper();
var dto = objectMapper.readValue(JSON, UserRequestDTO.class);
var strNoNullFields = objectMapper.writeValueAsString(dto);

That way the annotation is working.

Anyway this is not something very optimal. You might want to re-think your design how to calculate checksum (your question smells a bit like XY-problem).

CodePudding user response：

I need to generate the checksum of the payload excluding the null attrs. I do not want to replace null attr rather remove it. To generate the signature I will to doing .toString() on the request body

I think you are looking for a request has dinamyc attributes.

Try use a HashMap<String,Object> on parameters.

Other simple way is overriding toString() from DTO and ignore null attrs.

Sugestions: Besides using this only for logging I think both is bad practice could be better create a method generateSignature() handles all rules of this.