Spring Boot: 400 Bad Request when sending JSON POST request to REST API

I am working on a Spring Boot application where I am trying to save a Question entity using a POST API. However, whenever I send a JSON request from Postman, I receive 400 Bad Request.
I expected the request to be processed successfully and the data to be saved in the database.

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Controller

@RestController @RequestMapping("/api/questions") public class QuestionController { @Autowired private QuestionService questionService; @PostMapping public ResponseEntity<Question> createQuestion(@RequestBody Question question) { return ResponseEntity.ok(questionService.save(question)); } }

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Entity

@Entity public class Question { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; private String title; private String content; // getters and setters }

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JSON Request (Postman)

{ "title": "How to handle exceptions in Spring Boot?", "content": "I want to know the best practices for exception handling." }

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Error

400 Bad Request Required request body is missing

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What I Have Tried

Ensured @RequestBody is present

Verified JSON format

Checked Content-Type: application/json

Restarted the application

Enabled logging

But the issue still persists.

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Environment

Spring Boot: 3.x

Java: 17

OS: Ubuntu

Postman latest version