Unable to catch onFailure() GWT AsyncCallback

I am creating an appliaction which requires user authentication. I have one problem when I'm trying to log in. When I type a correct username and password, the onSuccess method is called. But when I type a wrong one, or empty fields, then the onFailure() method is NOT called.

I really want to know why this is happening. Because I wan't to display some sort of dialogbox when the username or password is incorrect.

This is the ClickHandler, which takes the username and password from the fields:

loginButton.addClickHandler(new ClickHandler() {            @Override          public void onClick(ClickEvent event) {              String username = usernameBox.getText();              String password = passwordBox.getText();              performUserConnection(username, password);          }      });

And this is the method that performs the user conenction, which as I said, works if I have a correct username/ password. It displays my alert message, but it does not display any alert message if it's not correct.

private static void performUserConnection(String username, String password) {      DBConnectionAsync rpcService = (DBConnectionAsync) GWT.create(DBConnection.class);      ServiceDefTarget target = (ServiceDefTarget) rpcService;      String moduleRelativeURL = GWT.getModuleBaseURL() + "DBConnectionImpl";      target.setServiceEntryPoint(moduleRelativeURL);        rpcService.authenticateUser(username, password, new AsyncCallback<User>() {            @Override          public void onSuccess(User user) {              Window.alert("TRALALA. Username: " + user.getUsername());          }            @Override          public void onFailure(Throwable caught) {              Window.alert("LALALALAL");              // DialogBox dialogBox = createDialogBox();              // dialogBox.setGlassEnabled(true);              // dialogBox.setAnimationEnabled(true);              // dialogBox.center();              // dialogBox.show();          }      });  }

Thanks in advance
 

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