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.
Well, that looks like code which might be approximately right for the problem you described. But I don't understand what a "common id value" is, and neither do I understand why you would want to set it. Perhaps you could explain?