public class UserPage extends WebPage implements Serializable {

    UserModelDao umd = new UserModelDaoImpl();
    List<UserModel> users = umd.listUsers();

    private ModalWindow modalWindow;

    public UserPage() {

        UserModel userModel = new UserModel();
        Form<?> form = new Form("form");
        TextField<String> id = new TextField<String>("id", new PropertyModel<String>(userModel, "id"));
        id.setOutputMarkupId(true);
        TextField<String> fName = new TextField<String>("fName", new PropertyModel<String>(userModel, "firstName"));
        fName.setOutputMarkupId(true);
        TextField<String> lName = new TextField<String>("lName", new PropertyModel<String>(userModel, "lastName"));
        lName.setOutputMarkupId(true);
        TextField<String> age = new TextField<String>("age", new PropertyModel<String>(userModel, "age"));
        age.setOutputMarkupId(true);

        Button button = new Button("submit") {
            @Override
            public void onSubmit() {
                super.onSubmit();

                umd.addUser(new UserModel(userModel.getId(),
                        userModel.getFirstName(),
                        userModel.getLastName(),
                        userModel.getAge()));
            }
        };

        add(form);
        form.add(id);
        form.add(fName);
        form.add(lName);
        form.add(age);
        form.add(button);


        add(new ListView<UserModel>("listView", users) {
            public void populateItem(final ListItem<UserModel> item) {
                final UserModel data = item.getModelObject();
                item.add(new Label("id", data.getId()));
                item.add(new Label("fName", data.getFirstName()));
                item.add(new Label("lName", data.getLastName()));
                item.add(new Label("age", data.getAge()));

                item.add(new Link<String>("edit") {
                    @Override
                    public void onClick() {
                        System.out.println("edit " + data.toString());
                    }
                });

                item.add(new Link<String>("delete") {
                    @Override
                    public void onClick() {
                        boolean b = umd.deleteUser(data);
                        if (b) {
                            System.out.println("deleted : " + data.toString());
                        }
                    }
                });
            }
        });
    }
}

<form wicket:id="form">
    <input type="text" wicket:id="id"/>
    <br/>
    <input type="text" wicket:id="fName"/>
    <br/>
    <input type="text" wicket:id="lName"/>
    <br/>
    <input type="text" wicket:id="age"/>
    <br/>
    <input type="submit" wicket:id="submit"/>
</form>
<br/><br/>
<table>
    <thead>
    <tr>
        <th>ID</th>
        <th>fName</th>
        <th>lName</th>
        <th>age</th>
        <th>edit</th>
        <th>delete</th>
    </tr>
    </thead>
    <tbody>
    <tr wicket:id="listView">
        <td wicket:id="id"></td>
        <td wicket:id="fName"></td>
        <td wicket:id="lName"></td>
        <td wicket:id="age"></td>
        <td wicket:id="edit"><a href="#">edit</a></td>
        <td wicket:id="delete"><a href="#">delete</a></td>
    </tr>
    </tbody>
</table>