"Authentic exam," means you will actually write, compile, debug, and test real software inorder to demonstrate your ability. The tasks all involve modifying and/or extending existing code, which is available for your review (see How to Prepare).
Coding tasks will be performed in a closed environment, meaning you will have no network access to search for examples or ask for help. The exam environment is Linux, and set up to include documentation and development software. The Java Platform is the Standard Edition 7 JDK.
The exam will take up to 6 hours. The exact date, time, location, and other details are available from your local host. You will not be allowed to use books, notes, or digital media (including cell phones) while taking the exam.