AJAX Button does not submit form if RequiredTextField is empty

[vov]

    Form<Void> form = new Form<Void>("form");
    form.add(new RequiredTextField<String>("filed"));
    final TextField<String> textField;
    form.add(textField = new TextField<String>("filed2", new
Model<String>()));
    form.add(new AjaxButton("button")
    {
      @Override
      protected void onSubmit(AjaxRequestTarget target,
@SuppressWarnings("hiding") Form<?> form)
      {
        System.out.println("Test." + textField.getConvertedInput());
        System.out.println("Test." + textField.getModelObject());
      }
    });

In case if "filed" is empty than onSubmit() method does not call after
submitting button.

I can find only one solution - to override process() and onValidate()
methods of form as fallows:

Form<Void> form = new Form<Void>("form")
    {
      @Override
      public void process(IFormSubmittingComponent submittingComponent)
      {
        if ("button".equals(submittingComponent.getInputName()))
        {
          getApplication().getSessionStore().setAttribute(getRequest(),
"button", true);
        }
        super.process(submittingComponent);
      }

      @SuppressWarnings("unchecked")
      @Override
      protected void onValidate()
      {
        if (getApplication().getSessionStore().getAttribute(getRequest(),
"unvalidate") != null
            && (Boolean)
getApplication().getSessionStore().getAttribute(getRequest(), "unvalidate"))
        {
          getApplication().getSessionStore().removeAttribute(getRequest(),
"button");
          Session.get().getFeedbackMessages().clear();
          return;
        }
      }
    };
...but IMHO it's not good:)

What is the correct way to solve this problem?

thanks in advance 
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