java - Set Authentication for Proxy with ProxySelector - Stack Overflow

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I am using SOAP to call API, and I can't use RestTemplate so I found the way use ProxySelector. But when my proxy is set with auth (username/password) I can't use SOAP with ProxySelector although I also set Authenticator in ProxySelector.

I get the message:

HTTP transport error: java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 407 Proxy Authentication Required

I'm sure my username and password for my proxy is correct. This is the code:

@Component
@Slf4j
public class CustomProxySelector extends ProxySelector {

  private ProxySelector def;

  private final List<Proxy> proxies = new ArrayList<>();

  @Value("${proxy-host:#{null}}")
  private String proxyHost;

  @Value("${proxy-port:#{null}}")
  private Integer proxyPort;

  @Value("${proxy-username:#{null}}")
  private String username;

  @Value("${proxy-password:#{null}}")
  private String password;

  @Value("${api}")
  private String api;

  @Value("${proxy.enable:false}")
  private boolean proxy;

  @PostConstruct
  public void init() {
    this.def = ProxySelector.getDefault();
    Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, (null == proxyPort) ? 80 : proxyPort));
    this.proxies.add(proxy);
    ProxySelector.setDefault(this);

    Authenticator.setDefault(new Authenticator() {
      @Override
      protected PasswordAuthentication getPasswordAuthentication() {
        return new PasswordAuthentication(username, password.toCharArray());
      }
    });
  }

  @Override
  public List<Proxy> select(URI uri) {

    if (StringUtilspare(uri.toString(), this.api) == 0 && Boolean.TRUE.equals(this.enableProxy)) {
      log.info(logString, uri, this.proxies);
      return this.proxies;
    }

    log.info(logString, uri, def.select(uri));
    return def.select(uri);
  }

  @Override
  public void connectFailed(URI uri, SocketAddress sa, IOException ioe) {
    log.info("Failed to connect to a proxy ({}) when connecting to {}", sa, uri.getHost());

    if (sa == null || ioe == null) {
      throw new IllegalArgumentException("Arguments can't be null.");
    }

    def.connectFailed(uri, sa, ioe);
  }
}

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