This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
You seem to have forgotten to ask a question? And if you're asking about why the exception occurs, it's really helpful if you tell us which line it happens on (which the exception message tells you). However, as a quick hint: your code assumes that query returns Person objects. Does it?
subject: Exception in thread "main" java.lang.ClassCastException: java.lang.Integer cannot be cast to chandra