This looks strange to me:

public class Example extends WebPage {

    public void Blank() {
        add(new RequiredTextField("username"));
    }
}

Why is Blank a Uppercase method name?
You don't have any constructor yet. So Blank never gets executed and the username component is not added to the page

try

public class Example extends WebPage {

    public Example() {
        add(new RequiredTextField("username"));
    }
}

or

public class Example extends WebPage {

    public Example() {
      Blank();
    }

    public void Blank() {
        add(new RequiredTextField("username"));
    }
}

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