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The Localizer is a utility class that encapsulates all of the localization related functionality in Wicket so it can be accessed by all areas of the framework in a consistent way. All classes derived from Component have a getLocalizer() method which retrieves the shared Localizer from the Application. The Localizer maintains a static cache of messages already retrieved by a key generated from the class, locale, style and messageKey for the message. Message bundles are looked up using classes derived from AbstractStringResourceLoader. The Localizer fetches a list of AbstractStringResourceLoader from the Application object. By default, the Application provides a ComponentStringResourceLoader and an ApplicationStringResourceLoadera ClassStringResourceLoader.

In the default setup, the ComponentStringResourceLoader is first asked to locate the message bundle. If it can't find one (using the algorithm described below), the ApplicationStringResourceLoader application's ClassStringResourceLoader is consulted next. The ApplicationStringResourceLoader ; this attempts to find a single resource bundle that has the same name and location as the application

The algorithm employed by ComponentStringResourceLoader to resolve message requests is described in the javadoc for the AbstractStringResourceLoaderComponentStringResourceLoader:

The component based string resource loader attempts to find the resource from a bundle that corresponds to the supplied component object or one of its parent containers. Generally the component will be an instance of Page, but it may also be an instance of any reusable component that is packaged along with its own resource files. If the component is not an instance of Page then it must be a component that has already been added to a page.

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