This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The only way I know is to try to set a cookie and see if it comes back in the next request. If you are trying to use a HttpSession, you can call the isNew() method - if the session is always new, the browser is not supporting cookies. Bill