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.
Yes, both are same. Whatever you declare in DD will be returned by the getMaxInactiveInterval method. both DD and setMaxInactiverInterval will behave in same way as long as the value is same if different then Programmatic values will always override DD values.