private void authenticate(String username, String password) {

        Objects.requireNonNull(username);
        Objects.requireNonNull(password);

        if (StringUtils.isEmpty(username)) throw new AuthenticationException();
        if (StringUtils.isEmpty(password)) throw new AuthenticationException();

        try {
            authenticationManager.authenticate(new UsernamePasswordAuthenticationToken(username, password));
        } catch (DisabledException e) {
            throw new AuthenticationException("User is disabled!", e);
        } catch (BadCredentialsException e) {
            throw new AuthenticationException("Bad credentials!", e);
        }
    }

@Bean
    public BCryptPasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder(12, new SecureRandom(SALT.getBytes()));
    }


String encryptedPassword = passwordEncoder().encode(user.getPassword());