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.
Rob, I think he's talking about parameters given to the JVM, not the application parameters.
"D", any parameters of the form -Dproperty=value can be retrieved through System.getProperties(). 99% of the time, that's all you need. If you are in that last 1%, take a look at RuntimeMXBean in the Java API. It might be able to give you the information you need.