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.
More than likely. This is a big argument for only placing sendRedirects and forwards in Servlets and never in JSPs. If the buffer for the output has filled, the response will be sent to the client, and the response is 'comitted'. That is, it is now too late to send them something else or somewhere else. You need to make these decisions before you start outputting data to the client, which is why the MVC architecture and Servlets is a much better way to manage this. Some people solve this by making the buffer larger, but this is inefficiant and only hides the problem. It doesn't solve it. Dave