This is the official Portlet 3.0 (JSR 362) integration for Vaadin 23.1+ applications.
Vaadin Portlet Starter Project is a skeleton single-module project that can be used as a starting point for your own Vaadin Portlet application.
Address Book is a demo application showcasing Vaadin Portlet multi-module setup, component-based views and inter-Portlet communication.
Read the documentation here.