I'm trying to create a web application using GeoServer.
When I try to see the file var/lib/tomcat8/webapps/geoserver/data/www/ol-demo.html, no map appears, just the title "GeoServer OpenLayers Demo" the frame, the zoom in/out.
I have installed GeoServer 2.8.1.
When I make a selection of a layer, I can see them through GeoServer in OpenLayers, but when typing http://localcost:8080/geoserver/www/ol-demo.html or ..../mytest.html, I see the page (no error 404) but I cannot see any map.
Can you help me?