This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
In servlet 3.0, Java introduce the new asynchronous feature where the user does not necessarily have to wait for the processing to complete, e.g. sending an email, kicking off a database job, etc. For such fire-and-forget scenarios we can use servlet's @Async support or place an event and return immediately,