<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.2.0.Final</version>
</dependency>
import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import java.util.Set;
public class ValidationExample {
public static void main(String[] args) {
Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
User user = new User("", "example@example.com");
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (violations.isEmpty()) {
} else {
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
}
}
}
class User {
private String username;
private String email;
}
