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.
Struts uses OGNL to identify resources in the value stack. The '#' character indicates a non-root entity (the action is usually the root) 'session' indicates the user session and 'login' indicates a session parameter named 'login'.