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 concept that used to be referred to as servlet "chaining" has been replaced with "Filters" as of the servlet 2.3 API. The main disadvantages as I see it: 1. Complex - more APIs 2. Slower than a single servlet Advantages: 1. Flexibility 2. Better separation of functions and potential for using library components. Bill