Have you changed the Liferay property “vaadin.widgetset” (portal-ext.properties, see e.g.
this page
) to “com.invient.vaadin.InvientChartsWidgetset” or defined an “widgetset” init-parameter to the portlet with the same value? By default it will use the “com.vaadin.portal.gwt.PortalDefaultWidgetSet” which does not contain any add-ons.
BTW: Vaadin Control Panel for Liferay should help you manage the widgetset automatically (it will overwrite the PortalDefaultWidgetSet though so it will be used by all portlets automatically)