Highlight the component as in the image below, then press Ctrl-/ (⌘-/ on Mac). Note. The Faces servlet is registered with the project, and the index.xhtml welcome page is now passed through the Faces servlet when it is requested. For more information, see JSF 2.x Support in NetBeans IDE. Place your cursor on any of the undeclared tags and press Ctrl-Space. Then right-click the GlassFish server on which the project is deployed and choose View Server Log. If you cannot see the number in the server log, try rebuilding the application by right-clicking the project node and choosing Clean and Build. The NetBeans IDE has provided long-standing support for JavaServer Faces.