This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
After the call to nextDouble, the pointer is at the end of the line, before the line break. So when you call nextLine() it returns the string that is between that place and the next line break -- an empty string! Next you try to get numbers from the scanner but it sees the word "first" which of course can't be parsed as an int.