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 am also new to Struts2 and got a same issue, but I know some for sure,that the url you need to access is
looks like you tried this one, since the error says you had given namespace / and action name getTutorial.