<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
public class User {
private String username;
}
@RestControllerAdvice
public class GlobalExceptionHandler {
@ExceptionHandler(MethodArgumentNotValidException.class)
public ResponseEntity<Map<String, String>> handleValidationExceptions(MethodArgumentNotValidException ex) {
Map<String, String> errors = new HashMap<>();
ex.getBindingResult().getAllErrors().forEach((error) -> {
String fieldName = ((FieldError) error).getField();
String errorMessage = error.getDefaultMessage();
errors.put(fieldName, errorMessage);
});
return ResponseEntity.badRequest().body(errors);
}
}
spring.mvc.throw-exception-if-no-handler-found=true
spring.resources.add-mappings=false
POST /users HTTP/1.1
Host: localhost:8080
Content-Type: application/json
{
"username": ""
}
HTTP/1.1 400 Bad Request
Content-Type: application/json
{
}
