The JSP are depraceted in the JSF 2.0 and the facelets are now preffered view technologie. JSF 2.0 with facelets view has a lot of new features which are not supported for JSP. Mainly build in ajax support. It would help to improve a metadata editor. JSP and facelets can be used together temporarily so only editor page, tiles and tiles layout and gpt jsp tags have to be rebuild at the beggining.