Validation in Spring Boot - spring-boot

Question

I don't why when I submit a POST request with an invalid numSeatAvailable. No error is return. I don't know if I missed anything. Could anyone help me please?
This is my request Class
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import java.sql.Time;
import java.sql.Date;
#Setter
#Getter
#ToString
public class RideRequest {
private Date date;
private Time time;
private String destination;
private String modelName;
private int modelYear;
#Min(value = 18, message = "Age should not be less than 18")
#Max(value = 150, message = "Age should not be greater than 150")
private int numSeatAvailable;
private String rideIntro;
private Long driverId;
private Long rideId;
}
This is my controller
#PostMapping("/createRide")
public String createRide(#Valid #RequestBody RideRequest rideRequest) {
System.out.println("Hello");
rideService.createRide(rideRequest);
return "created";
}

Answer 1

In your controller, you must return message, info when the DTO is not valid.
About validation, you have 3 ways:
(1) Add Hibernate validator dependency
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.1.6.Final</version>
</dependency>
Then add annotations for validate bean (DTO: Data Transfer Object).
(2) Ah, have an easy way for you: Use spring-boot-starter-validator (it is also a derived of Hibernate validator with pre and auto configuration). See tutorial at
https://reflectoring.io/bean-validation-with-spring-boot/ . I suggest you use this way.
(3) Use Java validation (standard library). Guide:
https://spring.io/guides/gs/validating-form-input/

Answer 2

You can use javax.validation.constraints Library
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version><!--$NO-MVN-MAN-VER$ -->
</dependency>
Add your constraitns to your DTO Model
for example :
#NotNull(groups = ProductCreation.class,message = "fieldName.notSetted")
#NotBlank(groups = ProductUpdate.class,message = "fieldName.notSetted")
#Min(value=1, message="fieldName must be equal or greater than 0")
And you can make function for validation :
private void checkIfReadyToSave(ClassDTO yourDTO) {
Set<ConstraintViolation<ClassDTO>> violations =
validator.validate(yourDTO, groupCreation.class);
if (!violations.isEmpty()) {
Map<String, Object> body = new LinkedHashMap<>();
Set<String> keys =
violations.stream().map(ConstraintViolation::getMessage).collect(Collectors.toSet());
body.put("errors", keys);
throw new BeanValidationException(ErrorConstants.ClassDTO_MISSING_ERROR_MSG, body.toString());
}
}