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-blank.war files come withe minimum resources required to run a Struts web app. The file contains the very basic struts jars, tlds and DD which one can be used as a base web app to modify/create new web app as per his/her design by introducing more JSP, Action classes and other resources. And its not mandatory, but to start with Struts project its suggested to study the directory structure of struts-blank.war file by unzipping it.