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.
My assignment is nearly completed. After packaging all files into runme.jar, I expect only one instance of the runme.jar in a machine at one time. I look many reference books, but can't find any related information.