What error do you have?
The obvious answer is that facelets 1.2 is different from 1.1.12 :-)
But I guess that does not solve your problem :-)
just 500 error,,, there's not message in console...
facelets1.2 have a filter that must added into web.xml, i think it's the problem...
Yes. As you know, the facelets 1.1.x do not require any filters. So, it is not enough to just replace jar, you have to do something extra to switch the version.
Do you have information what the filter should be. I tried to find it couple months ago, but it looked like not-yet-documented feature.