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The next thing to notice is the use of a Model object. As said earlier, every Wicket component has a model. What a component uses its model for, depends on the component. A label uses its model to render the tag body, but a ListView expects a java.util.List as the model object, and loops through its elements. A model can be anything, as long as it implements org.apache.wicket.model.IModel.

To process user input, you can use a Form. Forms update the models of their nested FormComponent}}-s automatically. It does this by calling {{setObject(...) on the object with the input for that specific component. Hence, when a user pushes the submit button, the model of the text field is updated with the value that was in the HTML input text field. As, in this example, the label and the text field share the same model, when the model is updated via the text field, the label will render the new model object value as well.