en la llamada agregar @valid
@PostMapping("/users")
public User addUser(@Valid @RequestBody User user) {
userService.save(user);
return user;
}
y en la clase user:
@NotBlank(message = "Please provide an email")
@Column(name="email")
private String email;
notBlank valida que el campo no sea nulo y que contenga al menos un caracter no blanco
la salida por default si se detectase el error seria asi
{
"timestamp": "2020-03-29T22:13:23.653+0000",
"status": 400,
"error": "Bad Request",
"errors": [
{
"codes": [
"NotBlank.user.email",
"NotBlank.email",
"NotBlank.java.lang.String",
"NotBlank"
],
"arguments": [
{
"codes": [
"user.email",
"email"
],
"arguments": null,
"defaultMessage": "email",
"code": "email"
}
],
"defaultMessage": "Please provide an email",
"objectName": "user",
"field": "email",
"rejectedValue": null,
"bindingFailure": false,
"code": "NotBlank"
}
],
"message": "Validation failed for object='user'. Error count: 1",
para hacer mas amigable esta salida
creamos la sigt clase:
package com.isra.Example3.error;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
@ControllerAdvice
public class CustomGlobalExceptionHandler extends ResponseEntityExceptionHandler {
@Override
protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex,
HttpHeaders headers, HttpStatus status, WebRequest request) {
Map<String, Object> body = new LinkedHashMap<>();
body.put("timestamp", new Date());
body.put("status", status.value());
//Get all errors
List<String> errors = ex.getBindingResult()
.getFieldErrors()
.stream()
.map(x -> x.getDefaultMessage())
.collect(Collectors.toList());
body.put("errors", errors);
return new ResponseEntity<>(body, headers, status);
}
}
y la salida sera
{
"timestamp": "2020-03-29T22:29:58.799+0000",
"status": 400,
"errors": [
"Please provide an email"
]
}
tambien podemos validar los parametros de entrada por ejemplo en un get
@Validated
public class UserRestController {
...
public ResponseEntity<User> getUser(@Min(1) @PathVariable int id) {
../
y la salida seria
{
"timestamp": "2020-03-29T23:10:02.890+0000",
"status": 500,
"error": "Internal Server Error",
"message": "getUser.id: tiene que ser mayor o igual que 1",
"trace": "javax..........
}
ss
el codigo de error 500 (internal server) no es correcto vamos a override el metodo constraintViolationException de nuestra clase CustomGlobalExceptionHandler
