JSON Serialization/Deserialization, @RequestBody, @ModelAttribute

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On JSON conversion

Serialization - converting to JSON

Deserialization - converting to a Java object

+) When returning an entity instead of a response DTO, if the entity has no @Getter, it won’t be serialized.

@RequestBody

• Works even without a @Setter or a constructor (a default constructor is still required).
• At least one of getter or setter must be defined so the field names can be determined for data binding.
• The annotation cannot be omitted.

@ModelAttribute

• Requires a @Setter or a constructor to work.
• Can’t handle data that isn’t in Query String or Form format (application/json won’t work).
• The annotation can be omitted.

References

https://tecoble.techcourse.co.kr/post/2021-05-11-requestbody-modelattribute/