Hello I'm a beginner in Java and I have problem with javax validation using SpringBoot. I created my own ExceptionHandler to handle validation exception: MethodArgumentNotValidException which is thrown when request is invalid.
Invalid JSON request example:
{
"code": "",
"name": ""
}
Controller:
@Controller
@RequestMapping("/v1/api")
public class ApiController {
@Autowired
private Service service;
@PostMapping("/")
public ResponseEntity<?> returnHomePage(@Valid @RequestBody RequestDTO requestDTO) {
return ResponseEntity.ok().body(service.getSomeData(requestDTO));
}
}
Class with javax validation annotations:
@Data
public class RequestDTO {
@NotBlank(message = "Return code is a required field")
@Size(min = 6, max = 10, message = "Return code must be in range 6-10 digits")
@Pattern(regexp = "[\\d]{6,10}", message = "Return code must be numeric")
private String code;
@NotBlank(message = "Name is a required field")
@Size(min = 1, max = 15, message = "Name must be in range 1-15 digits")
private String name;
}
Method in my Handler:
@ExceptionHandler(value = {MethodArgumentNotValidException.class})
public ResponseEntity<Object> handleBadRequestException(MethodArgumentNotValidException ex, WebRequest request) {
List<String> errorMessages = new ArrayList<>();
Map<String, List<String>> details = ex
.getBindingResult()
.getFieldErrors()
.stream()
.collect(Collectors.toMap(FieldError::getField, fieldError -> {
errorMessages.add(fieldError.getDefaultMessage());
return errorMessages;
}, (key, duplicatedKey) -> key));
ErrorMessage errorMessage = new ErrorMessage(HttpStatus.BAD_REQUEST.name().toLowerCase(), ex.getMessage(), details);
return new ResponseEntity<>(errorMessage, HttpStatus.BAD_REQUEST);
ErrorMessage class:
@Data
@AllArgsConstructor
public class ErrorMessage {
private final String key;
private final String msg;
private final Map<String, List<String>> details;
}
What I want to achieve is to get nested validation errors per field like in example below:
{
"key": "bad_request",
"msg": "Validation errors occurred",
"details": {
"code": [
"Return code must be numeric",
"Return code must be in range 6-10 digits",
"Return code is a required field",
],
"name": [
"Name must be in range 1-15 digits",
"Name is a required field",
]
}
}
What I am getting at this point:
{
"key": "bad_request",
"msg": "Validation errors occurred",
"details": {
"code": [
"Return code is a required field",
"Name is a required field",
"Return code must be in range 6-10 digits",
"Name must be in range 1-15 digits",
"Return code must be numeric"
],
"name": [
"Return code is a required field",
"Name is a required field",
"Return code must be in range 6-10 digits",
"Name must be in range 1-15 digits",
"Return code must be numeric"
]
}
}
As you can see both code and name keys get validation errors for both fields which ofc is wrong :) I'll be grateful for any help :)
