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.
1-The validation framework is only available in version 1.1 2-Having different modules in the same application is only available in 1.1 3-There are differences in how you set up the web.xml file and struts-config.xml file.
If at all possible, I'd recommend you use version 1.1 or above.