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.
i just bumped into this problem. well in my case it was easy to fix
i was using <login-page>/login.html</login-page>(wrong) instead of <form-login-page>/login.html</form-login-page> form some reason the parser didnt threw me an error
This error occurs when the container is unbale to pick up the login page at runtime. I would check that i have the right mapping in web.xml and the page is there in the right directory ect.