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.
Could you please share to me with brief explanation what is Spring about and should it implement to all new project ? what will be the challenges if we need to implement to existing project ? What are the most recommended features from Spring framework that user should really focus on ?