public static String getString(String key, final Locale loc, String... _params) {
	if (!exists()) {
		ThreadContext.setApplication(org.apache.wicket.Application.get(appName));
	}
	String[] params = _params;
	if ((params == null || params.length == 0) && STRINGS_WITH_APP.contains(key)) {
		params = new String[]{getApplicationName()};
	}
	Localizer l = get().getResourceSettings().getLocalizer();
	String value = l.getStringIgnoreSettings(key, null, null, loc, null, "[Missing]");
	if (params != null && params.length > 0) {
		final MessageFormat format = new MessageFormat(value, loc);
		value = format.format(params);
	}
	if (RuntimeConfigurationType.DEVELOPMENT == get().getConfigurationType()) {
		value += String.format(" [%s]", key);
	}
	return value;
}
 

/**
 * 
 * @param localizer
 * @param key
 * @param component
 * @return string
 */
private String getString(Localizer localizer, String key, Component component)
{
	triedKeys.add(key);

	// Note: It is important that the default value of "" is
	// provided to getString() not to throw a MissingResourceException or to
	// return a default string like "[Warning: String ..."
	return localizer.getString(key, component, "");
}
 

/**
 * @see org.apache.wicket.validation.IErrorMessageSource#getMessage(String, java.util.Map)
 */
@Override
public String getMessage(String key, Map<String, Object> vars)
{
	final FormComponent<T> formComponent = FormComponent.this;

	// Use the following log4j config for detailed logging on the property resolution
	// process
	// log4j.logger.org.apache.wicket.resource.loader=DEBUG
	// log4j.logger.org.apache.wicket.Localizer=DEBUG

	final Localizer localizer = formComponent.getLocalizer();

	// retrieve prefix that will be used to construct message keys
	String prefix = formComponent.getValidatorKeyPrefix();
	String message;

	// first try the full form of key [form-component-id].[prefix].[key]
	String resource = getId() + "." + prefix(prefix, key);
	message = getString(localizer, resource, formComponent);

	// if not found, try a more general form (without prefix)
	// [form-component-id].[key]
	if (Strings.isEmpty(message) && Strings.isEmpty(prefix))
	{
		resource = getId() + "." + key;
		message = getString(localizer, resource, formComponent);
	}

	// If not found try a more general form [prefix].[key]
	if (Strings.isEmpty(message))
	{
		resource = prefix(prefix, key);
		message = getString(localizer, resource, formComponent);
	}

	// If not found try the most general form [key]
	if (Strings.isEmpty(message))
	{
		// Try a variation of the resource key
		message = getString(localizer, key, formComponent);
	}

	// convert empty string to null in case our default value of "" was
	// returned from localizer
	if (Strings.isEmpty(message))
	{
		message = null;
	}
	else
	{
		message = substitute(message, addDefaultVars(vars));
	}
	return message;
}
 

@Provides
public Localizer getLocalizer(WebApplication application)
{
	return application.getResourceSettings().getLocalizer();
}