The program can be compiled & deployed without any problem. Say, now I am opening the chat page in two windows of my Firefox browsers. The first user "fox_a" is able to chat in the first window without any problem. But the 2nd user "fox_b" cannot view his/her chat text display in the 2nd window. (but fox_a is able to view messages from fox_b)
But if you use IE, the logging in button is not responding at all!
(I used Netbeans 6.8, Firefox 3.5, Glassfish 3, IE 8 & Chat application shipped with Java EE 6 download)