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//a list of User objects
final List<User> connections = getConnectionsForUser(userId);

//renderer - required when not using simple strings
AbstractAutoCompleteRenderer autoCompleteRenderer = new AbstractAutoCompleteRenderer() {
	protected final String getTextValue(final Object object) {
		User user = (User) object;
		return user.getDisplayName();
	}
	protected final void renderChoice(final Object object, final Response response, final String criteria) {
		response.write(getTextValue(object));
	}
	
};


// textfield
AbstractAutoCompleteTextField<User> toField = new AbstractAutoCompleteTextField<User>("toField", new PropertyModel(message, "to"), autoCompleteRenderer) {
	protected final List<User> getChoiceList(final String input) {
		return getConnectionsSubsetForSearch(connections, input);
	}

	protected final String getChoiceValue(final User choice) throws Throwable {
		return choice.IdgetId();
	}
};


form.add(toField);