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Home » Eclipse Projects » Eclipse Scout » Displaying useful messages to users after failed authentication(VetoException is not displaying a visible message box)
Displaying useful messages to users after failed authentication [message #1857173] Sat, 21 January 2023 10:17
J D is currently offline J DFriend
Messages: 102
Registered: February 2021
Senior Member
Hi there everyone,

I have a custom CredentialVerifier that I want to use to check for password validity and other issues related to user authentication.

I would like to be able to either
a) display a message box to the user if authentication failed
b) or, display a message as a string of text at the bottom of the login window

At the moment, I'm working on the first option but will eventually adopt the second option because it seems to be the accepted practice nowadays.

My problem at the moment is I cannot get the message box to appear when authentication fails. My throw new VetoException() calls do not produce the message box.

Here is my CredentialVerifier:


public class RestCredentialVerifier implements ICredentialVerifier {
  private static final Logger LOG = LoggerFactory.getLogger(RestCredentialVerifier.class);

  public int verify(String username, char[] passwordPlainText) throws IOException {
    LOG.debug("Method \"verify\" in RestCredentialVerifier. User " + username);

    // Test for missing username or password
    if (StringUtility.isNullOrEmpty(username) || passwordPlainText == null
        || passwordPlainText.length == 0) {
      throw new VetoException(TEXTS.get("MissingUsernameOrPassword"));      // [b]*** DOES NOT SHOW![/b]

    // Test for non-conforming password
    // Password MUST have between 8 to 20 characters with a minimum of one uppercase, one lowercase,
    // one number, one special character and without spaces
    if ((passwordPlainText.length < 8) || (passwordPlainText.length > 20)) {
      throw new VetoException(TEXTS.get("ThePasswordMustHaveBetween820Characters"));    //[b] *** DOES NOT SHOW![/b]

    Subject subject = new Subject();
    subject.getPrincipals().add(new SimplePrincipal("system"));
    RunContext runContext = RunContexts.empty().withLocale(Locale.getDefault()); // OK
    // RunContext runContext = RunContexts.copyCurrent(true).withSubject(subject);  // Fails

    Map<String, String> result = Callable<Map<String, String>>() {
      public Map<String, String> call() throws Exception {
        return BEANS.get(IRestAuthenticationService.class).verify(username, passwordPlainText));

    LOG.debug("Leaving method \"verify\" in RestCredentialVerifier. User " + username);
    if (result.containsKey("message")
        && result.get("message").equals(TEXTS.get("YouAreNowConnectedToTheServer"))) {
      return AUTH_OK;
    } else {
      return AUTH_FAILED;


Can anyone help me implement (a) and (b)?

Thanks a lot for your kind assistance.



[Updated on: Sat, 21 January 2023 10:46]

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