login

package com.knoldus.user;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.Scanner;
import java.util.Set;

public class Login {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        
        System.out.println("Please enter the username");
        String username = sc.nextLine();
        
        System.out.println("Please enter the password");
        String password = sc.nextLine();
        
        try {
            ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
            Validator validator = factory.getValidator();
            User newUser = User.builder()
                    .username(username)
                    .password(password)
                    .build();
            Set<ConstraintViolation<User>> violations = validator.validate(newUser);
            
            for (ConstraintViolation<User> violation : violations) {
                if (!("".equals(violation.getMessage()))) {
                    throw new RuntimeException(violation.getMessage());
                    
                }
                
            }
            
            System.out.println("User created");
            
            System.out.println(newUser.getUsername() + " Created\n");
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
            
        }
    }
}