用户点击后退按钮后退出停留在同一页面上

After logout the user is directed to login page. Now, if user clicks on back button it should stay on login page itself. How can I make it possible by using code in java? I have used Servlet Filter... Tried invalidating session.I have even tried clearing cache(Expires, Cache-Control, Pragma).But got no success yet. Or maybe I’m using this in wrong way. Please guide me the correct way.After logout the user is directed to login page