I tried it a couple of days ago and didn't have a problem. As far as I know, Facebook only uses Java for the "Video" Application. If this application appeared on the page you were trying to look that might have caused the error.
I'm also suffering from problems connecting to facebook, the mobile version works fine, but i feel it is too limited.
when i try to connect to the normal face book, i enter my username and password, then tap login, after that i just get returned to the same page, but the login button is then dissabled!