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.
To test a web application, you can use JWebUnit or Selenium. The former is pure Java code to write tests, but doesn't execute in a real browser. There are a few ways to write Selenium tests - one is Java - and it does run in a real browser