Validation For Rest API
For Validation need to add dependancy in Pom xml file
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
also Added jakarta.validation.constraints on User Pojo Class
@Size(min = 2)
private String name;
@Past
private LocalDate birthDate;
@Pattern(regexp = "^[a-zA-Z0-9+_.-]+@[a-zA-Z0-9.-]+$")
private String emailID;
Also Add @Valid Annothation in Post request of Resrouse Creation
@PostMapping("/users")
public ResponseEntity<User> addUser(@Valid @RequestBody User user) {
User savedUser = userDaoService.save(user);
URI location = ServletUriComponentsBuilder.fromCurrentRequest()
.path("/{id}")
.buildAndExpand(savedUser.getId())
.toUri();
return ResponseEntity.created(location).build();
}
For less than 2 size Name OR Future Date OR wrong mail pattern will give you
same error which is 400 Bad Request Only
To Resolve the Generic Exception as Bad Request to Proper Exception
to handle by giving proper Response to Consumer of this Service by Adding
your Exception into the your @ControlerAdvice Exception Class
where you can handle the all the exception
Given below Customized ResponseEntityExceptionHandler class
extends ResponseEntityExceptionHandler which handle diffrernt not valid argument exceptions
handleMethodArgumentNotValid this method override from ResponseEntityExceptionHandler
also we have created ErrorDetails Class which will set the Response as PoJo
and return if this exception occured
@ControllerAdvice
public class CustomizedResponseEntityExceptionHandler extends ResponseEntityExceptionHandler {
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(
MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatusCode status, WebRequest request) {
ErrorDetails errorDetails = new ErrorDetails(LocalDateTime.now(),
ex.getMessage(), request.getDescription(false), "Bad Request");
return new ResponseEntity<Object>(errorDetails, HttpStatus.BAD_REQUEST);
}
}
public class ErrorDetails {
private LocalDateTime timestamp;
private String message;
private String details;
private String errorGenerator;
//constructor and getter/setter
}
now with Post Body
Post Request body
Get Response as
private Integer id;
@Size(min = 2, message = "Name min size is 2 atleast")
private String name;
@Past(message = "birthDate should be lessthan from todays date")
private LocalDate birthDate;
@Pattern(regexp = "^[a-zA-Z0-9+_.-]+@[a-zA-Z0-9.-]+$", message = "email in not in proepr format")
private String emailID;
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(
MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatusCode status, WebRequest request) {
ErrorDetails errorDetails = new ErrorDetails(LocalDateTime.now(),
ex.getFieldError().getDefaultMessage(), request.getDescription(false), "Bad Request");
return new ResponseEntity<Object>(errorDetails, HttpStatus.BAD_REQUEST);
}
Also Can singleout all the error at once by using list of error ex.getFieldErrors()
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(
MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatusCode status, WebRequest request) {
StringBuilder sb = new StringBuilder();
for(FieldError s : ex.getFieldErrors()) {
sb.append(s.getDefaultMessage());
}
ErrorDetails errorDetails = new ErrorDetails(LocalDateTime.now(),
sb.toString(), request.getDescription(false), "Bad Request");
return new ResponseEntity<Object>(errorDetails, HttpStatus.BAD_REQUEST);
}
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