<dependency>
<groupId>jakarta.validation</groupId>
<artifactId>jakarta.validation-api</artifactId>
<version>2.0.2</version>
</dependency>
public class User {
@NotNull
private String name;
@Size(min = 6, max = 12)
private String password;
// Getter and Setter methods
}
public class Main {
public static void main(String[] args) {
User user = new User();
user.setName(null);
user.setPassword("12345");
ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
Validator validator = factory.getValidator();
Set<ConstraintViolation<User>> violations = validator.validate(user);
if (violations.isEmpty()) {
} else {
for (ConstraintViolation<User> violation : violations) {
System.out.println(violation.getMessage());
}
}
}
}
