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.
The idea of a Portal is that you have a Portal server that serves "portlets" which are widget-like page fragments that are combined into a single page. The specification most commonly used to create portlets in Java is JSR 168.