You'll definitely (unless you did a custom install) have Java on your machine, but for LW it's always best to have the most recent version. Open your System prefs & open Software Update & let it scan for any possible updates you might need. Whether Java is the sole reason you can't connect, I don't know. You haven't told us anything about your setup other than it's OSX. What type of connection do you have, are there firewalls, your OSX version, networks, & anything else that might help us to try to problem solve your issue.