Message.java

package com.example.jacksondemo.dto;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;

import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class Message {

	private Long id;

	private LocalDate created;

	private String title;

	private User author;

	private String body = "hola!";

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public LocalDate getCreated() {
		return created;
	}

	public void setCreated(LocalDate created) {
		this.created = created;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public User getAuthor() {
		return author;
	}

	public void setAuthor(User author) {
		this.author = author;
	}

	public String getBody() {
		return body;
	}

	public void setBody(String body) {
		this.body = body;
	}

}

MessageController.java

package com.example.jacksondemo.rest;

import javax.validation.Valid;

import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.example.jacksondemo.dto.Message;

@RestController
public class MessageController {

  @PostMapping("/")
  public void createMessage(@Valid @RequestBody Message message) {
    System.out.println("Success ! " + message.getBody());
  }

}

test.sh

curl -X POST \
  http://localhost:8080/ \
  -H 'cache-control: no-cache' \
  -H 'content-type: application/json' \
  -d '{
	"title": "abc"	
}'