wicket.markup.html.form.TextField

<input type="text" wicket:id="text" />
<input type="text" wicket:id="integer" />

    // add a simple text field that uses Input's 'text' property. Nothing can go wrong here
    form.add(new TextField("text"));

    // here we add a text field that uses Input's 'integer' property. Something could go
    // wrong here, as the user's (textual) input might be an invalid value for an
    // Integer object. If we provide the class constructor argument like we do here, we
    // get two things:
    // 1. A type validator is added, so that before any actual updating is tried, first the
    //     user input is checked for validity. When the user input is wrong for an integer,
    //    the model updating is cancelled, and an error message is displayed to the user
    // 2.When updating the model, the given type is explicitly used instead of trying
    //    to figure out what type should be converted to.
    // Note that the default validation message mechanism uses resource bundles for the actual
    // message lookup. The message for this component can be found in TextFieldPage.properties
    // with key 'form.integer.IConverter'. Read more about how this works in the javadocs
    // of AbstractValidator
    form.add(new TextField("integer", Integer.class));