Java developers

Looking for reviews of the "Sybex Java 2 Certification Virtual Test Center". This isn't the cramsession on a cd, it is just a testing suite... Any former users?
-Mel

error: java.security.AccessControlException: access denied (java.net.SocketPermission 192.168.2.0.13:2345 connect, resolve)



I'm writing a chat server and client and i'm to the point where i'm ready to test it. It works if i use 127.0.0.1 as the IP address but when i use something that isn't local host then i get that error above. Whats up with that? I've tryed doing a little research and I added the following lines to my code:
( My Added CodeCollapse )