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'd have to go with turning off JSP validation, since JSPs are compiled on the server, not the IDE. WSAD/RAD can be finicky about JSP formatting. Just verify that after you deploy the application the JSP can compile/run properly from the server.