Define the value returned by Application.getProjectStage(). Allowed values: Production, Development, UnitTest, SystemTest, Extension. Default value is Production. javax.faces.PROJECT_STAGE Development Do not render comments in facelets (xhtml) pages. Default is false. javax.faces.FACELETS_SKIP_COMMENTS true Faces Servlet javax.faces.webapp.FacesServlet 1 Faces Servlet *.xhtml 404 /error.xhtml 500 /error.xhtml home.xhtml