Spring basic serialization example

UserController.java

import io.junquera.ca.back.entities.User;
import org.json.JSONObject;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class LogController {

    @PostMapping("/user")
    public void user(@RequestBody User u) throws JsonProcessingException {
      System.out.println(u.getUsername()));  
    }
  
    @PutMapping("/user")
    public void rawUser(@RequestBody String jsonRaw) throws JsonProcessingException {
      
        ObjectMapper mapper=new ObjectMapper();
        User u = mapper.readValue(jsonRaw, User.class);

        JSONObject json = new JSONObject(jsonRaw);
        System.out.println(json.keySet());
        System.out.println("Correct: " + (json.get("username") == u.getUsername()));
        
    }

}