This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I have done the logoff application by adding the following line
but after I clicked on logoff button its is working fine and redirecting to home page, then after i click on the back button in the browser, the previous functionality is still working. what would I do to prevent the previous functionality? or else is there any chances to lock the previous page?