@Override
    protected void onInitialize() {
      super.onInitialize();
      Form.findForm(this).add(new AbstractFormValidator() {

        private static final long serialVersionUID = 1L;

        @Override
        public void validate(Form<?> form) {
          if (/* ... */) {
            form.error("price too small");
          }
        }

        @Override
        public FormComponent<?>[] getDependentFormComponents() {
          return null;
        }
      });
    }

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