Heiko Bobzin

My appreciation goes to Dirk Bartels, Andreas Renner, Michael Damkier, and the Java team at Poet. Dirk Bartels, co-founder and former president, encouraged me to join the Java Data Objects Group in 1999 and to write this book. Andreas and Michael spent many hours working with me on JDO concepts and e- mails . Finally, thanks to my wife for her patience and support.