Today we will add simple listing view for locations added to the database in previous posts.  I said ‘simple’ as there are some more sophisticated ways to show many items using Wicket but probably we will not have many locations to show in our application so simple view without pagination should be ok. More complicated way (DataTable component) will be covered in the future when we will add ‘listing items’ feature’.

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As I promised in the previous post, today we will focus on transforming our unique name validator in Wicket to generic one. So now, let’s simply list what we are going to achieve;

• validator should validate any entity object in our project
• validator should check unique value of any property from validated object
• error message should be generic too but customization should be easy

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Welcome back to our Wicket tutorial series! As I mentioned in previous post, today we will concentrate on building validator stopping user from adding item location with non-unique name. At first we will start with non-generic but working validator and then we will try to make is as flexible as possible. Ok, so let’s write some code!

Problem

As you might remember, currently we have Wicket form with basic validation checking existence of name field and whether its length is in proper range or not:

		Form<AddLocationPage> addLocationForm = new Form<AddLocationPage>("addLocationForm",
				new CompoundPropertyModel<AddLocationPage>(this));
		add(addLocationForm);

		Label nameLabel = new Label("nameLabel", "Location name");
		addLocationForm.add(nameLabel);

		RequiredTextField<String> nameField = new RequiredTextField<String>("name");
		nameField.add(LengthBetweenValidator.lengthBetween(MIN_LOCATION_NAME_LENGTH, MAX_LOCATION_NAME_LENGTH));
		addLocationForm.add(nameField);

		Button submitButton = new Button("submitButton") {
			@Override
			public void onSubmit() {
				Location location = new Location(name);
				locationService.save(location);

				getSession().info("Location added successfully");
				setResponsePage(LocationsPage.class);
			}
		};
		addLocationForm.add(submitButton);

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